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Date: Fri, 9 Oct 2026 23:51:57 +0900
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부르크뮐러와 슈만 연습곡 30개의 공개 등록과 MIDI 및 원본·생성 자료를 제거했다. 정확한 파일명만 제외 목록에 넣어 재시작 후 재등록을 막았다. 회원 업로드와 기존 기본 샘플은 유지했다.

운영 백업: /home/syskiller/piano/backups/bach-to-basics/20261009-withdraw-practice-30. 격리 테스트 5개 통과. 운영 재시작 뒤 HTTPS 목록과 DB 및 파일에서 철회곡 0개를 확인했다. 회원 업로드 2건과 기존 기본 샘플 7개 보존.
---
 PROJECT_MEMORY.md                             |   6 +
 README.md                                     |   2 +-
 backend/library_db.py                         |  17 +-
 .../sample_midi/practice-burgmuller-01.mid    | Bin 1884 -> 0 bytes
 .../sample_midi/practice-burgmuller-02.mid    | Bin 1752 -> 0 bytes
 .../sample_midi/practice-burgmuller-03.mid    | Bin 1873 -> 0 bytes
 .../sample_midi/practice-burgmuller-04.mid    | Bin 2120 -> 0 bytes
 .../sample_midi/practice-burgmuller-05.mid    | Bin 1808 -> 0 bytes
 .../sample_midi/practice-burgmuller-06.mid    | Bin 1692 -> 0 bytes
 .../sample_midi/practice-burgmuller-07.mid    | Bin 2196 -> 0 bytes
 .../sample_midi/practice-burgmuller-08.mid    | Bin 1897 -> 0 bytes
 .../sample_midi/practice-burgmuller-09.mid    | Bin 2935 -> 0 bytes
 .../sample_midi/practice-burgmuller-10.mid    | Bin 2193 -> 0 bytes
 .../sample_midi/practice-burgmuller-11.mid    | Bin 1746 -> 0 bytes
 .../sample_midi/practice-burgmuller-12.mid    | Bin 3732 -> 0 bytes
 .../sample_midi/practice-burgmuller-13.mid    | Bin 2337 -> 0 bytes
 .../sample_midi/practice-burgmuller-14.mid    | Bin 2601 -> 0 bytes
 .../sample_midi/practice-burgmuller-15.mid    | Bin 3015 -> 0 bytes
 .../sample_midi/practice-burgmuller-16.mid    | Bin 1740 -> 0 bytes
 .../sample_midi/practice-burgmuller-17.mid    | Bin 1935 -> 0 bytes
 .../sample_midi/practice-burgmuller-18.mid    | Bin 2386 -> 0 bytes
 backend/sample_midi/practice-schumann-01.mid  | Bin 2837 -> 0 bytes
 backend/sample_midi/practice-schumann-02.mid  | Bin 2127 -> 0 bytes
 backend/sample_midi/practice-schumann-03.mid  | Bin 2651 -> 0 bytes
 backend/sample_midi/practice-schumann-04.mid  | Bin 1353 -> 0 bytes
 backend/sample_midi/practice-schumann-05.mid  | Bin 1963 -> 0 bytes
 backend/sample_midi/practice-schumann-06.mid  | Bin 2185 -> 0 bytes
 backend/sample_midi/practice-schumann-07.mid  | Bin 3334 -> 0 bytes
 backend/sample_midi/practice-schumann-08.mid  | Bin 2365 -> 0 bytes
 backend/sample_midi/practice-schumann-09.mid  | Bin 1979 -> 0 bytes
 backend/sample_midi/practice-schumann-10.mid  | Bin 1821 -> 0 bytes
 backend/sample_midi/practice-schumann-11.mid  | Bin 4657 -> 0 bytes
 backend/sample_midi/practice-schumann-12.mid  | Bin 7346 -> 0 bytes
 backend/sample_midi/practice_collection.json  | 722 ------------------
 backend/tests/test_library_db.py              |  10 +-
 .../tools/practice_sources/burgmuller-01.mid  | Bin 2564 -> 0 bytes
 .../tools/practice_sources/burgmuller-01.rdf  |  36 -
 .../tools/practice_sources/burgmuller-02.mid  | Bin 2643 -> 0 bytes
 .../tools/practice_sources/burgmuller-02.rdf  |  36 -
 .../tools/practice_sources/burgmuller-03.mid  | Bin 3416 -> 0 bytes
 .../tools/practice_sources/burgmuller-03.rdf  |  36 -
 .../tools/practice_sources/burgmuller-04.mid  | Bin 3860 -> 0 bytes
 .../tools/practice_sources/burgmuller-04.rdf  |  36 -
 .../tools/practice_sources/burgmuller-05.mid  | Bin 2139 -> 0 bytes
 .../tools/practice_sources/burgmuller-05.rdf  |  36 -
 .../tools/practice_sources/burgmuller-06.mid  | Bin 2148 -> 0 bytes
 .../tools/practice_sources/burgmuller-06.rdf  |  36 -
 .../tools/practice_sources/burgmuller-07.mid  | Bin 2293 -> 0 bytes
 .../tools/practice_sources/burgmuller-07.rdf  |  36 -
 .../tools/practice_sources/burgmuller-08.mid  | Bin 2958 -> 0 bytes
 .../tools/practice_sources/burgmuller-08.rdf  |  36 -
 .../tools/practice_sources/burgmuller-09.mid  | Bin 5072 -> 0 bytes
 .../tools/practice_sources/burgmuller-09.rdf  |  36 -
 .../tools/practice_sources/burgmuller-10.mid  | Bin 2773 -> 0 bytes
 .../tools/practice_sources/burgmuller-10.rdf  |  36 -
 .../tools/practice_sources/burgmuller-11.mid  | Bin 2432 -> 0 bytes
 .../tools/practice_sources/burgmuller-11.rdf  |  36 -
 .../tools/practice_sources/burgmuller-12.mid  | Bin 5949 -> 0 bytes
 .../tools/practice_sources/burgmuller-12.rdf  |  36 -
 .../tools/practice_sources/burgmuller-13.mid  | Bin 2810 -> 0 bytes
 .../tools/practice_sources/burgmuller-13.rdf  |  36 -
 .../tools/practice_sources/burgmuller-14.mid  | Bin 3272 -> 0 bytes
 .../tools/practice_sources/burgmuller-14.rdf  |  36 -
 .../tools/practice_sources/burgmuller-15.mid  | Bin 6911 -> 0 bytes
 .../tools/practice_sources/burgmuller-15.rdf  |  36 -
 .../tools/practice_sources/burgmuller-16.mid  | Bin 2599 -> 0 bytes
 .../tools/practice_sources/burgmuller-16.rdf  |  36 -
 .../tools/practice_sources/burgmuller-17.mid  | Bin 2710 -> 0 bytes
 .../tools/practice_sources/burgmuller-17.rdf  |  36 -
 .../tools/practice_sources/burgmuller-18.mid  | Bin 2946 -> 0 bytes
 .../tools/practice_sources/burgmuller-18.rdf  |  36 -
 backend/tools/practice_sources/catalog.json   | 182 -----
 .../tools/practice_sources/schumann-01.mid    | Bin 2883 -> 0 bytes
 .../tools/practice_sources/schumann-01.rdf    |  36 -
 .../tools/practice_sources/schumann-02.mid    | Bin 3061 -> 0 bytes
 .../tools/practice_sources/schumann-02.rdf    |  36 -
 .../tools/practice_sources/schumann-03.mid    | Bin 2673 -> 0 bytes
 .../tools/practice_sources/schumann-03.rdf    |  36 -
 .../tools/practice_sources/schumann-04.mid    | Bin 2237 -> 0 bytes
 .../tools/practice_sources/schumann-04.rdf    |  36 -
 .../tools/practice_sources/schumann-05.mid    | Bin 2677 -> 0 bytes
 .../tools/practice_sources/schumann-05.rdf    |  36 -
 .../tools/practice_sources/schumann-06.mid    | Bin 3763 -> 0 bytes
 .../tools/practice_sources/schumann-06.rdf    |  36 -
 .../tools/practice_sources/schumann-07.mid    | Bin 5633 -> 0 bytes
 .../tools/practice_sources/schumann-07.rdf    |  36 -
 .../tools/practice_sources/schumann-08.mid    | Bin 3954 -> 0 bytes
 .../tools/practice_sources/schumann-08.rdf    |  36 -
 .../tools/practice_sources/schumann-09.mid    | Bin 3003 -> 0 bytes
 .../tools/practice_sources/schumann-09.rdf    |  36 -
 .../tools/practice_sources/schumann-10.mid    | Bin 3299 -> 0 bytes
 .../tools/practice_sources/schumann-10.rdf    |  36 -
 .../tools/practice_sources/schumann-11.mid    | Bin 7081 -> 0 bytes
 .../tools/practice_sources/schumann-11.rdf    |  36 -
 .../tools/practice_sources/schumann-12.mid    | Bin 11654 -> 0 bytes
 .../tools/practice_sources/schumann-12.rdf    |  36 -
 docs/LIBRARY-AUTH-KO.md                       |   2 +-
 docs/THIRD_PARTY_SAMPLES.md                   |  11 -
 scripts/build_practice_collection.mjs         | 113 ---
 scripts/check_practice_collection.mjs         |  35 -
 수정기록.txt                                  |   7 +
 101 files changed, 22 insertions(+), 2165 deletions(-)
 delete mode 100644 backend/sample_midi/practice-burgmuller-01.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-02.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-03.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-04.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-05.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-06.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-07.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-08.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-09.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-10.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-11.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-12.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-13.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-14.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-15.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-16.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-17.mid
 delete mode 100644 backend/sample_midi/practice-burgmuller-18.mid
 delete mode 100644 backend/sample_midi/practice-schumann-01.mid
 delete mode 100644 backend/sample_midi/practice-schumann-02.mid
 delete mode 100644 backend/sample_midi/practice-schumann-03.mid
 delete mode 100644 backend/sample_midi/practice-schumann-04.mid
 delete mode 100644 backend/sample_midi/practice-schumann-05.mid
 delete mode 100644 backend/sample_midi/practice-schumann-06.mid
 delete mode 100644 backend/sample_midi/practice-schumann-07.mid
 delete mode 100644 backend/sample_midi/practice-schumann-08.mid
 delete mode 100644 backend/sample_midi/practice-schumann-09.mid
 delete mode 100644 backend/sample_midi/practice-schumann-10.mid
 delete mode 100644 backend/sample_midi/practice-schumann-11.mid
 delete mode 100644 backend/sample_midi/practice-schumann-12.mid
 delete mode 100644 backend/sample_midi/practice_collection.json
 delete mode 100644 backend/tools/practice_sources/burgmuller-01.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-01.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-02.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-02.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-03.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-03.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-04.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-04.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-05.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-05.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-06.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-06.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-07.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-07.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-08.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-08.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-09.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-09.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-10.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-10.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-11.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-11.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-12.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-12.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-13.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-13.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-14.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-14.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-15.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-15.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-16.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-16.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-17.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-17.rdf
 delete mode 100644 backend/tools/practice_sources/burgmuller-18.mid
 delete mode 100644 backend/tools/practice_sources/burgmuller-18.rdf
 delete mode 100644 backend/tools/practice_sources/catalog.json
 delete mode 100644 backend/tools/practice_sources/schumann-01.mid
 delete mode 100644 backend/tools/practice_sources/schumann-01.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-02.mid
 delete mode 100644 backend/tools/practice_sources/schumann-02.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-03.mid
 delete mode 100644 backend/tools/practice_sources/schumann-03.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-04.mid
 delete mode 100644 backend/tools/practice_sources/schumann-04.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-05.mid
 delete mode 100644 backend/tools/practice_sources/schumann-05.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-06.mid
 delete mode 100644 backend/tools/practice_sources/schumann-06.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-07.mid
 delete mode 100644 backend/tools/practice_sources/schumann-07.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-08.mid
 delete mode 100644 backend/tools/practice_sources/schumann-08.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-09.mid
 delete mode 100644 backend/tools/practice_sources/schumann-09.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-10.mid
 delete mode 100644 backend/tools/practice_sources/schumann-10.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-11.mid
 delete mode 100644 backend/tools/practice_sources/schumann-11.rdf
 delete mode 100644 backend/tools/practice_sources/schumann-12.mid
 delete mode 100644 backend/tools/practice_sources/schumann-12.rdf
 delete mode 100644 scripts/build_practice_collection.mjs
 delete mode 100644 scripts/check_practice_collection.mjs

diff --git a/PROJECT_MEMORY.md b/PROJECT_MEMORY.md
index f22ef35..8de2b50 100644
--- a/PROJECT_MEMORY.md
+++ b/PROJECT_MEMORY.md
@@ -34,6 +34,12 @@
 - 운영 DB와 수정 대상 소스 및 기존 MIDI 파일의 백업은 `/home/syskiller/piano/backups/bach-to-basics/20261009-practice-30-intro-ending`에 있다. 백엔드만 다시 빌드했고 프런트엔드는 재시작하지 않았다. 공개 HTTPS 첫 화면과 비회원 목록의 새 곡 30개 및 각 파일의 MIDI 다운로드를 확인했다. 기존 회원 업로드 2건은 유지됐다.
 - 30곡은 공개 도메인 또는 CC BY-SA로 표시된 고전 연습곡의 편곡이다. 특정 한국 쇼츠의 곡을 전사한 자료는 아니다. 실제 피아노 건반으로 각 곡의 연주감과 MIDI 입력을 확인하는 작업은 남아 있다.
 
+## 2026-10-09 연습곡 30개 철회
+
+- 위 30곡은 사용자 요청과 맞지 않아 운영 공개 목록과 MIDI 파일 및 생성 자료에서 모두 제거했다. 회원 업로드와 기존 기본 샘플 7개는 변경하지 않았다.
+- 재시작 후에도 다시 등록되지 않도록 해당 30개 파일명을 제외 목록에 넣었다. Git 기록은 다시 쓰지 않고 삭제를 새 커밋으로 남긴다.
+- 철회 직전 DB와 30개 MIDI 및 원본·생성 자료의 백업은 `/home/syskiller/piano/backups/bach-to-basics/20261009-withdraw-practice-30`에 있다. 백엔드만 다시 빌드했다. 재시작 후 HTTPS 공개 목록 0건과 DB 0건 및 MIDI 파일 0개를 확인했다. 회원 업로드 2건과 기존 기본 샘플 7개는 보존됐다.
+
 ## 2026-10-03 현재 상태
 
 - Docker의 `piano-bach-frontend`와 `piano-bach-backend`로 운영한다.
diff --git a/README.md b/README.md
index 065255c..9f9750a 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ A browser-based piano practice tool. Drop in a **MIDI file**, a **MusicXML score
 
 이 저장소는 원본 Bach to Basics를 바탕으로 `learn.itosm.co.kr`에서 운영하는 한국어판이다. 독립 회원과 곡·악보 보관함을 제공한다. 비회원은 공개 곡을 연주할 수 있으며 회원은 MIDI와 MusicXML과 MXL 및 PDF 악보를 올려 공개 범위와 회원 등급을 지정할 수 있다.
 
-기본 공개 자료는 Mutopia Project의 MIDI와 그 원곡에서 만든 단계별 연습 편곡 및 도입부와 마무리를 갖춘 양손 연습곡 30개다. `엘리제를 위하여 WoO 59`는 난이도가 다른 버전을 같은 제목 아래에서 선택한다. 출처와 편곡 범위 및 권리 표시는 [기본 공개 샘플 출처](docs/THIRD_PARTY_SAMPLES.md)에 기록했다. 회원과 운영 구성은 [회원과 곡 보관함 운영 문서](docs/LIBRARY-AUTH-KO.md)를 따른다.
+기본 공개 자료는 Mutopia Project의 MIDI와 그 원곡에서 만든 단계별 연습 편곡이다. `엘리제를 위하여 WoO 59`는 난이도가 다른 버전을 같은 제목 아래에서 선택한다. 출처와 편곡 범위 및 권리 표시는 [기본 공개 샘플 출처](docs/THIRD_PARTY_SAMPLES.md)에 기록했다. 회원과 운영 구성은 [회원과 곡 보관함 운영 문서](docs/LIBRARY-AUTH-KO.md)를 따른다.
 
 [![Bach to Basics demo](docs/demo.gif)](https://raw.githubusercontent.com/gigliof/bach-to-basics/main/docs/demo.gif)
 
diff --git a/backend/library_db.py b/backend/library_db.py
index e977be0..eab93d2 100644
--- a/backend/library_db.py
+++ b/backend/library_db.py
@@ -180,17 +180,6 @@ SAMPLES = (
     },
 )
 
-# 별도 목록은 원본 MIDI와 권리 표시를 함께 보관한다. 화면에 쓰는 필드만 기본 샘플에 합친다.
-PRACTICE_COLLECTION = json.loads(
-    (Path(__file__).with_name("sample_midi") / "practice_collection.json").read_text(encoding="utf-8")
-)
-SAMPLES += tuple(
-    {key: item[key] for key in (
-        "storage_name", "title", "artist", "description", "difficulty", "genre", "arrangement", "tags"
-    )}
-    for item in PRACTICE_COLLECTION
-)
-
 LEGACY_SAMPLE_KEYS = (
     "first-snow-melody.mid",
     "first-snow-accompaniment.mid",
@@ -201,14 +190,16 @@ LEGACY_SAMPLE_KEYS = (
     "evening-waltz-beginner.mid",
     "sunrise-arpeggio-easy.mid",
     "black-key-pentatonic-beginner.mid",
+) + tuple(f"practice-burgmuller-{number:02}.mid" for number in range(1, 19)) + tuple(
+    f"practice-schumann-{number:02}.mid" for number in range(1, 13)
 )
 
 
 def _seed_samples() -> None:
     source_root = Path(__file__).with_name("sample_midi")
     with connect() as connection:
-        # 초기 시험용으로 만든 짧은 음형은 실제 공개 도메인 연습곡으로 교체한다.
-        # seed_key가 정확히 일치하는 기본 자료만 지우므로 회원 업로드에는 영향을 주지 않는다.
+        # 사용자 요청으로 철회한 기본 연습곡만 제거한다. 회원 업로드에는 영향을 주지 않는다.
+        # 재시작 후에도 다시 등록되지 않도록 철회한 파일 이름을 정확히 지정한다.
         placeholders = ",".join("?" for _ in LEGACY_SAMPLE_KEYS)
         connection.execute(
             f"DELETE FROM midi_items WHERE owner_id IS NULL AND seed_key IN ({placeholders})",
diff --git a/backend/sample_midi/practice-burgmuller-01.mid b/backend/sample_midi/practice-burgmuller-01.mid
deleted file mode 100644
index 09b4f783dda4605c41004e92f02ac209c39ea0da..0000000000000000000000000000000000000000
GIT binary patch
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diff --git a/backend/sample_midi/practice_collection.json b/backend/sample_midi/practice_collection.json
deleted file mode 100644
index 2a21d9e..0000000
--- a/backend/sample_midi/practice_collection.json
+++ /dev/null
@@ -1,722 +0,0 @@
-[
-  {
-    "storage_name": "practice-burgmuller-01.mid",
-    "title": "부르크뮐러 25곡 1번 순진",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Candeur 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-202. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-01/25EF-01.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-01/25EF-01.rdf",
-    "source_title": "La Candeur",
-    "source_id": "Mutopia-2013/01/12-202",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-02.mid",
-    "title": "부르크뮐러 25곡 2번 아라베스크",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "l'Arabesque 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-203. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-02/25EF-02.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-02/25EF-02.rdf",
-    "source_title": "l'Arabesque",
-    "source_id": "Mutopia-2013/01/12-203",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-03.mid",
-    "title": "부르크뮐러 25곡 3번 목가",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Pastorale 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-218. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-03/25EF-03.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-03/25EF-03.rdf",
-    "source_title": "La Pastorale",
-    "source_id": "Mutopia-2013/01/12-218",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-04.mid",
-    "title": "부르크뮐러 25곡 4번 작은 모임",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Petite Réunion 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-219. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-04/25EF-04.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-04/25EF-04.rdf",
-    "source_title": "La Petite Réunion",
-    "source_id": "Mutopia-2013/01/12-219",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-05.mid",
-    "title": "부르크뮐러 25곡 5번 순수",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Innocence 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-214. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-05/25EF-05.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-05/25EF-05.rdf",
-    "source_title": "Innocence",
-    "source_id": "Mutopia-2013/01/12-214",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-06.mid",
-    "title": "부르크뮐러 25곡 6번 진보",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Progrès 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-215. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-06/25EF-06.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-06/25EF-06.rdf",
-    "source_title": "Progrès",
-    "source_id": "Mutopia-2013/01/12-215",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-07.mid",
-    "title": "부르크뮐러 25곡 7번 맑은 시냇물",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Le Courant Limpide 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-216. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-07/25EF-07.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-07/25EF-07.rdf",
-    "source_title": "Le Courant Limpide",
-    "source_id": "Mutopia-2013/01/12-216",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-08.mid",
-    "title": "부르크뮐러 25곡 8번 우아함",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Gracieuse 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-217. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-08/25EF-08.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-08/25EF-08.rdf",
-    "source_title": "La Gracieuse",
-    "source_id": "Mutopia-2013/01/12-217",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-09.mid",
-    "title": "부르크뮐러 25곡 9번 사냥",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Chasse 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-220. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-09/25EF-09.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-09/25EF-09.rdf",
-    "source_title": "La Chasse",
-    "source_id": "Mutopia-2013/01/12-220",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-10.mid",
-    "title": "부르크뮐러 25곡 10번 여린 꽃",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Tendre Fleur 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-221. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-10/25EF-10.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-10/25EF-10.rdf",
-    "source_title": "Tendre Fleur",
-    "source_id": "Mutopia-2013/01/12-221",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-11.mid",
-    "title": "부르크뮐러 25곡 11번 할미새",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Bergeronnette 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-222. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-11/25EF-11.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-11/25EF-11.rdf",
-    "source_title": "La Bergeronnette",
-    "source_id": "Mutopia-2013/01/12-222",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-12.mid",
-    "title": "부르크뮐러 25곡 12번 이별",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "L'Adieu 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-223. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "intermediate",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "중급",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-12/25EF-12.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-12/25EF-12.rdf",
-    "source_title": "L'Adieu",
-    "source_id": "Mutopia-2013/01/12-223",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-13.mid",
-    "title": "부르크뮐러 25곡 13번 위안",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Consolation 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-224. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-13/25EF-13.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-13/25EF-13.rdf",
-    "source_title": "Consolation",
-    "source_id": "Mutopia-2013/01/12-224",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-14.mid",
-    "title": "부르크뮐러 25곡 14번 슈타이어 춤",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Styrienne 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-225. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-14/25EF-14.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-14/25EF-14.rdf",
-    "source_title": "La Styrienne",
-    "source_id": "Mutopia-2013/01/12-225",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-15.mid",
-    "title": "부르크뮐러 25곡 15번 발라드",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Ballade 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-227. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-15/25EF-15.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-15/25EF-15.rdf",
-    "source_title": "Ballade",
-    "source_id": "Mutopia-2013/01/12-227",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 93.8
-  },
-  {
-    "storage_name": "practice-burgmuller-16.mid",
-    "title": "부르크뮐러 25곡 16번 작은 탄식",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Douce Plainte 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-228. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-16/25EF-16.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-16/25EF-16.rdf",
-    "source_title": "Douce Plainte",
-    "source_id": "Mutopia-2013/01/12-228",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-17.mid",
-    "title": "부르크뮐러 25곡 17번 수다쟁이",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "La Babillarde 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-229. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "입문",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-17/25EF-17.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-17/25EF-17.rdf",
-    "source_title": "La Babillarde",
-    "source_id": "Mutopia-2013/01/12-229",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-burgmuller-18.mid",
-    "title": "부르크뮐러 25곡 18번 불안",
-    "artist": "요한 프리드리히 부르크뮐러",
-    "description": "Inquiétude 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2013/01/12-230. 조판: Bas Wassink. Public Domain.",
-    "difficulty": "easy",
-    "genre": "낭만주의 연습곡",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "부르크뮐러",
-      "쉬움",
-      "공개 도메인"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-18/25EF-18.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-18/25EF-18.rdf",
-    "source_title": "Inquiétude",
-    "source_id": "Mutopia-2013/01/12-230",
-    "maintainer": "Bas Wassink",
-    "license": "Public Domain",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-schumann-01.mid",
-    "title": "슈만 어린이를 위한 앨범 1번 멜로디",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 1.Mélodie 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-647. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-01-melodie/schumann-op68-01-melodie.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-01-melodie/schumann-op68-01-melodie.rdf",
-    "source_title": "Album pour la jeunesse - 1.Mélodie",
-    "source_id": "Mutopia-2007/02/11-647",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 107
-  },
-  {
-    "storage_name": "practice-schumann-02.mid",
-    "title": "슈만 어린이를 위한 앨범 2번 군대 행진곡",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 2.Marche militaire 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-650. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-02-marche-militaire/schumann-op68-02-marche-militaire.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-02-marche-militaire/schumann-op68-02-marche-militaire.rdf",
-    "source_title": "Album pour la jeunesse - 2.Marche militaire",
-    "source_id": "Mutopia-2007/02/11-650",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-schumann-03.mid",
-    "title": "슈만 어린이를 위한 앨범 3번 흥얼거리는 노래",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 3.Chanson fredonnée 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2011/09/18-651. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 3.0 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-03-chanson-fredonnee/schumann-op68-03-chanson-fredonnee.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-03-chanson-fredonnee/schumann-op68-03-chanson-fredonnee.rdf",
-    "source_title": "Album pour la jeunesse - 3.Chanson fredonnée",
-    "source_id": "Mutopia-2011/09/18-651",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 3.0",
-    "duration_seconds": 106
-  },
-  {
-    "storage_name": "practice-schumann-04.mid",
-    "title": "슈만 어린이를 위한 앨범 4번 코랄",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 4.Un choral 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-782. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-04-choral/schumann-op68-04-choral.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-04-choral/schumann-op68-04-choral.rdf",
-    "source_title": "Album pour la jeunesse - 4.Un choral",
-    "source_id": "Mutopia-2007/02/11-782",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 104.7
-  },
-  {
-    "storage_name": "practice-schumann-05.mid",
-    "title": "슈만 어린이를 위한 앨범 5번 작은 소품",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 5.Petite pièce 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-653. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-05-petite-piece/schumann-op68-05-petite-piece.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-05-petite-piece/schumann-op68-05-petite-piece.rdf",
-    "source_title": "Album pour la jeunesse - 5.Petite pièce",
-    "source_id": "Mutopia-2007/02/11-653",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 96.6
-  },
-  {
-    "storage_name": "practice-schumann-06.mid",
-    "title": "슈만 어린이를 위한 앨범 6번 가엾은 고아",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 6.Pauvre orpheline 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-687. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-06-pauvre-orpheline/schumann-op68-06-pauvre-orpheline.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-06-pauvre-orpheline/schumann-op68-06-pauvre-orpheline.rdf",
-    "source_title": "Album pour la jeunesse - 6.Pauvre orpheline",
-    "source_id": "Mutopia-2007/02/11-687",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 109.8
-  },
-  {
-    "storage_name": "practice-schumann-07.mid",
-    "title": "슈만 어린이를 위한 앨범 7번 사냥꾼의 노래",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 7.Chanson du chasseur 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/05/20-691. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 3.0 동일 조건 편곡.",
-    "difficulty": "easy",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "쉬움",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-07-chanson-du-chasseur/schumann-op68-07-chanson-du-chasseur.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-07-chanson-du-chasseur/schumann-op68-07-chanson-du-chasseur.rdf",
-    "source_title": "Album pour la jeunesse - 7.Chanson du chasseur",
-    "source_id": "Mutopia-2007/05/20-691",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 3.0",
-    "duration_seconds": 82.8
-  },
-  {
-    "storage_name": "practice-schumann-08.mid",
-    "title": "슈만 어린이를 위한 앨범 8번 거친 기수",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 8.Le cavalier sauvage 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-655. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "easy",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "쉬움",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-08-cavalier-sauvage/schumann-op68-08-cavalier-sauvage.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-08-cavalier-sauvage/schumann-op68-08-cavalier-sauvage.rdf",
-    "source_title": "Album pour la jeunesse - 8.Le cavalier sauvage",
-    "source_id": "Mutopia-2007/02/11-655",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-schumann-09.mid",
-    "title": "슈만 어린이를 위한 앨범 9번 민요",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 9.Chanson populaire 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-675. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-09-chanson-populaire/schumann-op68-09-chanson-populaire.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-09-chanson-populaire/schumann-op68-09-chanson-populaire.rdf",
-    "source_title": "Album pour la jeunesse - 9.Chanson populaire",
-    "source_id": "Mutopia-2007/02/11-675",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 93.1
-  },
-  {
-    "storage_name": "practice-schumann-10.mid",
-    "title": "슈만 어린이를 위한 앨범 10번 즐거운 농부",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 10.Le gai laboureur 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-659. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "beginner",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "입문",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-10-gai-laboureur/schumann-op68-10-gai-laboureur.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-10-gai-laboureur/schumann-op68-10-gai-laboureur.rdf",
-    "source_title": "Album pour la jeunesse - 10.Le gai laboureur",
-    "source_id": "Mutopia-2007/02/11-659",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 69
-  },
-  {
-    "storage_name": "practice-schumann-11.mid",
-    "title": "슈만 어린이를 위한 앨범 11번 시칠리아 춤곡",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 11.Sicilienne 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-783. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "easy",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "쉬움",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-11-sicilienne/schumann-op68-11-sicilienne.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-11-sicilienne/schumann-op68-11-sicilienne.rdf",
-    "source_title": "Album pour la jeunesse - 11.Sicilienne",
-    "source_id": "Mutopia-2007/02/11-783",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 133.6
-  },
-  {
-    "storage_name": "practice-schumann-12.mid",
-    "title": "슈만 어린이를 위한 앨범 12번 무서운 아저씨",
-    "artist": "로베르트 슈만",
-    "description": "Album pour la jeunesse - 12.Le Père Fouettard 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project Mutopia-2007/02/11-784. 조판: Philippe Hézaine. Creative Commons Attribution-ShareAlike 2.5 동일 조건 편곡.",
-    "difficulty": "intermediate",
-    "genre": "낭만주의 소품",
-    "arrangement": "piano_solo",
-    "tags": [
-      "양손",
-      "도입부",
-      "마무리",
-      "슈만",
-      "중급",
-      "CC BY-SA"
-    ],
-    "source_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-12-Pere-Fouettard/schumann-op68-12-Pere-Fouettard.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-12-Pere-Fouettard/schumann-op68-12-Pere-Fouettard.rdf",
-    "source_title": "Album pour la jeunesse - 12.Le Père Fouettard",
-    "source_id": "Mutopia-2007/02/11-784",
-    "maintainer": "Philippe Hézaine",
-    "license": "Creative Commons Attribution-ShareAlike 2.5",
-    "duration_seconds": 117.7
-  }
-]
diff --git a/backend/tests/test_library_db.py b/backend/tests/test_library_db.py
index 5f10bc6..0ef4c50 100644
--- a/backend/tests/test_library_db.py
+++ b/backend/tests/test_library_db.py
@@ -57,7 +57,7 @@ class LibraryDatabaseTest(unittest.TestCase):
             self.assertNotIn("오른손", sample["tags"])
             self.assertNotIn("쉬운 반주", sample["tags"])
 
-    def test_practice_collection_is_seeded_as_public(self) -> None:
+    def test_withdrawn_practice_collection_is_not_seeded(self) -> None:
         names = {f"practice-burgmuller-{number:02}.mid" for number in range(1, 19)}
         names.update(f"practice-schumann-{number:02}.mid" for number in range(1, 13))
         with self.db.connect() as connection:
@@ -65,12 +65,8 @@ class LibraryDatabaseTest(unittest.TestCase):
                 "SELECT seed_key, visibility, min_tier, owner_id FROM midi_items WHERE seed_key IS NOT NULL"
             ).fetchall()
         matching = {row["seed_key"]: row for row in rows if row["seed_key"] in names}
-        self.assertEqual(set(matching), names)
-        for name, row in matching.items():
-            self.assertEqual(row["visibility"], "public")
-            self.assertEqual(row["min_tier"], 0)
-            self.assertIsNone(row["owner_id"])
-            self.assertTrue(Path(self.temp.name, "midi", name).is_file())
+        self.assertFalse(matching)
+        self.assertFalse(any(Path(self.temp.name, "midi", name).exists() for name in names))
         self.assertFalse(any(row["seed_key"] in self.db.LEGACY_SAMPLE_KEYS for row in rows))
 
 
diff --git a/backend/tools/practice_sources/burgmuller-01.mid b/backend/tools/practice_sources/burgmuller-01.mid
deleted file mode 100644
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GIT binary patch
literal 0
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diff --git a/backend/tools/practice_sources/burgmuller-01.rdf b/backend/tools/practice_sources/burgmuller-01.rdf
deleted file mode 100644
index fcc5153..0000000
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+++ /dev/null
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-
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-    <mp:title>La Candeur</mp:title>
-    <mp:composer>BurgmullerJFF</mp:composer>
-    <mp:opus>Opus 100.</mp:opus>
-    <mp:lyricist/>
-    <mp:for>Piano</mp:for>
-    <mp:date>19th Century</mp:date>
-    <mp:style>Romantic</mp:style>
-    <mp:metre>Allegro moderato</mp:metre>
-    <mp:arranger/>
-    <mp:source>Collection Litolff, 19th Century</mp:source>
-    <mp:licence>Public Domain</mp:licence>
-
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-    <mp:midFile>25EF-01.mid</mp:midFile>
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-    <mp:pngWidth>539</mp:pngWidth>
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-    <mp:id>Mutopia-2013/01/12-202</mp:id>
-    <mp:maintainer>Bas Wassink</mp:maintainer>
-    <mp:maintainerEmail>basvanlola@zonnet.com</mp:maintainerEmail>
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-    <mp:moreInfo/>
-    <mp:lilypondVersion>2.16.1</mp:lilypondVersion>
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diff --git a/backend/tools/practice_sources/burgmuller-02.mid b/backend/tools/practice_sources/burgmuller-02.mid
deleted file mode 100644
index 19450b1e36d81c793ff29677bf8d3070e17897ea..0000000000000000000000000000000000000000
GIT binary patch
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diff --git a/backend/tools/practice_sources/burgmuller-02.rdf b/backend/tools/practice_sources/burgmuller-02.rdf
deleted file mode 100644
index 6547402..0000000
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+++ /dev/null
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-<rdf:Description rdf:about=".">
-    <mp:title>l'Arabesque</mp:title>
-    <mp:composer>BurgmullerJFF</mp:composer>
-    <mp:opus>Opus 100.</mp:opus>
-    <mp:lyricist/>
-    <mp:for>Piano</mp:for>
-    <mp:date>19th Century</mp:date>
-    <mp:style>Romantic</mp:style>
-    <mp:metre>Allegro scherzando</mp:metre>
-    <mp:arranger/>
-    <mp:source>Collection Litolff, 19th Century</mp:source>
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diff --git a/backend/tools/practice_sources/burgmuller-03.mid b/backend/tools/practice_sources/burgmuller-03.mid
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diff --git a/backend/tools/practice_sources/burgmuller-03.rdf b/backend/tools/practice_sources/burgmuller-03.rdf
deleted file mode 100644
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-    <mp:for>Piano</mp:for>
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diff --git a/backend/tools/practice_sources/burgmuller-04.rdf b/backend/tools/practice_sources/burgmuller-04.rdf
deleted file mode 100644
index 0742d9d..0000000
--- a/backend/tools/practice_sources/burgmuller-04.rdf
+++ /dev/null
@@ -1,36 +0,0 @@
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-    <mp:composer>BurgmullerJFF</mp:composer>
-    <mp:opus>Opus 100.</mp:opus>
-    <mp:lyricist/>
-    <mp:for>Piano</mp:for>
-    <mp:date>19th Century</mp:date>
-    <mp:style>Romantic</mp:style>
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-    <mp:arranger/>
-    <mp:source>Collection Litolff, 19th Century</mp:source>
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-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-01/25EF-01.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-01/25EF-01.rdf",
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-  {
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-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-02/25EF-02.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-02/25EF-02.rdf",
-    "rights": []
-  },
-  {
-    "name": "burgmuller-03",
-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-03/25EF-03.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-03/25EF-03.rdf",
-    "rights": []
-  },
-  {
-    "name": "burgmuller-04",
-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-04/25EF-04.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-04/25EF-04.rdf",
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-    "name": "burgmuller-05",
-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-05/25EF-05.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-05/25EF-05.rdf",
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-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-06/25EF-06.rdf",
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-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-07/25EF-07.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-07/25EF-07.rdf",
-    "rights": []
-  },
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-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-08/25EF-08.mid",
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-    "midi_url": "https://www.mutopiaproject.org/ftp/BurgmullerJFF/O100/25EF-09/25EF-09.mid",
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-    "midi_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-06-pauvre-orpheline/schumann-op68-06-pauvre-orpheline.mid",
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-    "rights": []
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-    "midi_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-07-chanson-du-chasseur/schumann-op68-07-chanson-du-chasseur.mid",
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-    "rights": []
-  },
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-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-08-cavalier-sauvage/schumann-op68-08-cavalier-sauvage.rdf",
-    "rights": []
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-  {
-    "name": "schumann-09",
-    "midi_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-09-chanson-populaire/schumann-op68-09-chanson-populaire.mid",
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-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-11-sicilienne/schumann-op68-11-sicilienne.rdf",
-    "rights": []
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-    "midi_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-12-Pere-Fouettard/schumann-op68-12-Pere-Fouettard.mid",
-    "rdf_url": "https://www.mutopiaproject.org/ftp/SchumannR/O68/schumann-op68-12-Pere-Fouettard/schumann-op68-12-Pere-Fouettard.rdf",
-    "rights": []
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diff --git a/backend/tools/practice_sources/schumann-11.rdf b/backend/tools/practice_sources/schumann-11.rdf
deleted file mode 100644
index 8d6f747..0000000
--- a/backend/tools/practice_sources/schumann-11.rdf
+++ /dev/null
@@ -1,36 +0,0 @@
-<?xml version="1.0"?>
-<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-         xmlns:mp="http://www.mutopiaproject.org/piece-data/0.1/">
-
-<rdf:Description rdf:about=".">
-    <mp:title>Album pour la jeunesse - 11.Sicilienne </mp:title>
-    <mp:composer>SchumannR</mp:composer>
-    <mp:opus>O 68 n°11 </mp:opus>
-    <mp:lyricist/>
-    <mp:for>Piano</mp:for>
-    <mp:date>1848</mp:date>
-    <mp:style>Romantic</mp:style>
-    <mp:metre/>
-    <mp:arranger/>
-    <mp:source>Peters</mp:source>
-    <mp:licence>Creative Commons Attribution-ShareAlike 2.5</mp:licence>
-
-    <mp:lyFile>schumann-op68-11-sicilienne.ly</mp:lyFile>
-    <mp:midFile>schumann-op68-11-sicilienne.mid</mp:midFile>
-    <mp:psFileA4>schumann-op68-11-sicilienne-a4.ps.gz</mp:psFileA4>
-    <mp:pdfFileA4>schumann-op68-11-sicilienne-a4.pdf</mp:pdfFileA4>
-    <mp:psFileLet>schumann-op68-11-sicilienne-let.ps.gz</mp:psFileLet>
-    <mp:pdfFileLet>schumann-op68-11-sicilienne-let.pdf</mp:pdfFileLet>
-    <mp:pngFile>schumann-op68-11-sicilienne-preview.png</mp:pngFile>
-    <mp:pngHeight>108</mp:pngHeight>
-    <mp:pngWidth>549</mp:pngWidth>
-
-    <mp:id>Mutopia-2007/02/11-783</mp:id>
-    <mp:maintainer>Philippe Hézaine</mp:maintainer>
-    <mp:maintainerEmail>philippe.hezaine@free.fr</mp:maintainerEmail>
-    <mp:maintainerWeb/>
-    <mp:moreInfo/>
-    <mp:lilypondVersion>2.10.16</mp:lilypondVersion>
-</rdf:Description>
-
-</rdf:RDF>
diff --git a/backend/tools/practice_sources/schumann-12.mid b/backend/tools/practice_sources/schumann-12.mid
deleted file mode 100644
index 0a9b244696796b951b2c01fc6b5a4eec81b02d0d..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/backend/tools/practice_sources/schumann-12.rdf b/backend/tools/practice_sources/schumann-12.rdf
deleted file mode 100644
index 4e18ead..0000000
--- a/backend/tools/practice_sources/schumann-12.rdf
+++ /dev/null
@@ -1,36 +0,0 @@
-<?xml version="1.0"?>
-<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-         xmlns:mp="http://www.mutopiaproject.org/piece-data/0.1/">
-
-<rdf:Description rdf:about=".">
-    <mp:title>Album pour la jeunesse - 12.Le Père Fouettard </mp:title>
-    <mp:composer>SchumannR</mp:composer>
-    <mp:opus>O 68 n°12 </mp:opus>
-    <mp:lyricist/>
-    <mp:for>Piano</mp:for>
-    <mp:date>1848</mp:date>
-    <mp:style>Romantic</mp:style>
-    <mp:metre/>
-    <mp:arranger/>
-    <mp:source>Peters</mp:source>
-    <mp:licence>Creative Commons Attribution-ShareAlike 2.5</mp:licence>
-
-    <mp:lyFile>schumann-op68-12-Pere-Fouettard.ly</mp:lyFile>
-    <mp:midFile>schumann-op68-12-Pere-Fouettard.mid</mp:midFile>
-    <mp:psFileA4>schumann-op68-12-Pere-Fouettard-a4.ps.gz</mp:psFileA4>
-    <mp:pdfFileA4>schumann-op68-12-Pere-Fouettard-a4.pdf</mp:pdfFileA4>
-    <mp:psFileLet>schumann-op68-12-Pere-Fouettard-let.ps.gz</mp:psFileLet>
-    <mp:pdfFileLet>schumann-op68-12-Pere-Fouettard-let.pdf</mp:pdfFileLet>
-    <mp:pngFile>schumann-op68-12-Pere-Fouettard-preview.png</mp:pngFile>
-    <mp:pngHeight>122</mp:pngHeight>
-    <mp:pngWidth>549</mp:pngWidth>
-
-    <mp:id>Mutopia-2007/02/11-784</mp:id>
-    <mp:maintainer>Philippe Hézaine</mp:maintainer>
-    <mp:maintainerEmail>philippe.hezaine@free.fr</mp:maintainerEmail>
-    <mp:maintainerWeb/>
-    <mp:moreInfo/>
-    <mp:lilypondVersion>2.10.16</mp:lilypondVersion>
-</rdf:Description>
-
-</rdf:RDF>
diff --git a/docs/LIBRARY-AUTH-KO.md b/docs/LIBRARY-AUTH-KO.md
index 9c477fd..e6008a0 100644
--- a/docs/LIBRARY-AUTH-KO.md
+++ b/docs/LIBRARY-AUTH-KO.md
@@ -74,7 +74,7 @@ Mutopia Project가 공개 도메인으로 배포하는 실제 클래식 MIDI를
 - 미뉴에트 내림마장조 WoO 82: 쉬운 양손 편곡과 중급 양손 원곡
 - 엘리제를 위하여 WoO 59: 입문 양손과 쉬운 양손 및 고급 원곡
 
-같은 제목의 난이도별 버전은 한 묶음에서 선택한다. 기본 단계별 연습곡은 모두 오른손과 왼손을 포함한 피아노 독주로 제공한다. 손별 연습은 연습 화면에서 선택한다. 공개 도메인 원곡에서 만든 단계별 연습 편곡은 `scripts/build_sample_variants.mjs`로 다시 만들 수 있다. 별도로 등록한 30곡의 양손 연습 편곡은 `node scripts/build_practice_collection.mjs`로 다시 만들 수 있다.
+같은 제목의 난이도별 버전은 한 묶음에서 선택한다. 기본 단계별 연습곡은 모두 오른손과 왼손을 포함한 피아노 독주로 제공한다. 손별 연습은 연습 화면에서 선택한다. 공개 도메인 원곡에서 만든 단계별 연습 편곡은 `scripts/build_sample_variants.mjs`로 다시 만들 수 있다.
 
 ## 악보 표시
 
diff --git a/docs/THIRD_PARTY_SAMPLES.md b/docs/THIRD_PARTY_SAMPLES.md
index 33abd5e..be5fbf8 100644
--- a/docs/THIRD_PARTY_SAMPLES.md
+++ b/docs/THIRD_PARTY_SAMPLES.md
@@ -25,14 +25,3 @@ Mutopia Project의 배포 안내는 <https://www.mutopiaproject.org/legal.html>
 | 엘리제를 위하여 WoO 59 | 고급 | 전체 양손 원곡 | `fur-elise.mid` |
 
 편곡 파일은 `node scripts/build_sample_variants.mjs`로 다시 만들 수 있다. 원본 MIDI가 바뀌면 생성 결과도 달라지므로 반영 전에 파일 크기와 음표 수와 실제 재생을 다시 검사한다.
-
-## 도입부와 마무리가 있는 연습곡 30개
-
-서로 다른 원곡 30개를 바탕으로 오른손의 중심 선율과 왼손의 저음을 골라 양손 연습용으로 편곡했다. 각 MIDI에는 원곡 첫 선율을 천천히 들려주는 도입부와 마지막 선율을 다시 들려주고 종지음을 유지하는 마무리가 있다. 곡 길이는 69~134초다. 난이도는 오른손 음표 밀도에 따라 입문과 쉬움과 중급으로 나눈다. 복잡한 곡을 입문이라고 표시하지 않는다.
-
-- 부르크뮐러 Op. 100의 서로 다른 연습곡 18개: 원본 MIDI와 RDF의 표시는 모두 Public Domain이다. 원본 조판자는 Bas Wassink이다.
-- 슈만 Op. 68의 서로 다른 소품 12개: 원본 MIDI의 조판자는 Philippe Hézaine이다. RDF에 표시된 각 곡의 [CC BY-SA 2.5](https://creativecommons.org/licenses/by-sa/2.5/) 또는 [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/) 조건을 편곡본에도 적용한다.
-
-곡별 원문 제목과 원본 MIDI 주소와 RDF 주소와 조판자와 정확한 라이선스 버전은 [`practice_collection.json`](../backend/sample_midi/practice_collection.json)에 기록했다. 받은 원본 MIDI와 RDF는 [`practice_sources`](../backend/tools/practice_sources)에 함께 보관한다. MIDI는 `node scripts/build_practice_collection.mjs`로 다시 만들고 `node scripts/check_practice_collection.mjs`로 검증한다. 회원 업로드와 구분되는 기본 공개 자료만 교체한다.
-
-유튜브 영상은 이 30곡의 음원이나 MIDI 출처가 아니다. 공개 시청이 가능한 영상이라는 이유만으로 선율을 복제하지 않았다. 특정 쇼츠에 나온 곡을 그대로 옮기는 작업은 별도의 이용 허락과 원본 확인이 필요하다.
diff --git a/scripts/build_practice_collection.mjs b/scripts/build_practice_collection.mjs
deleted file mode 100644
index ff9566c..0000000
--- a/scripts/build_practice_collection.mjs
+++ /dev/null
@@ -1,113 +0,0 @@
-import fs from 'node:fs';
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-import midiPackage from '../frontend/node_modules/@tonejs/midi/build/Midi.js';
-
-const { Midi } = midiPackage;
-const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
-const sourceRoot = path.join(root, 'backend', 'tools', 'practice_sources');
-const outputRoot = path.join(root, 'backend', 'sample_midi');
-const catalog = JSON.parse(fs.readFileSync(path.join(sourceRoot, 'catalog.json'), 'utf8'));
-const names = {
-  burgmuller: ['순진', '아라베스크', '목가', '작은 모임', '순수', '진보', '맑은 시냇물', '우아함', '사냥', '여린 꽃', '할미새', '이별', '위안', '슈타이어 춤', '발라드', '작은 탄식', '수다쟁이', '불안'],
-  schumann: ['멜로디', '군대 행진곡', '흥얼거리는 노래', '코랄', '작은 소품', '가엾은 고아', '사냥꾼의 노래', '거친 기수', '민요', '즐거운 농부', '시칠리아 춤곡', '무서운 아저씨'],
-};
-
-const field = (rdf, key) => rdf.match(new RegExp(`<mp:${key}>([^<]*)</mp:${key}>`))?.[1]?.trim() ?? '';
-const clamp = (value, low, high) => Math.max(low, Math.min(high, value));
-
-function addNote(track, note, time, duration, velocity) {
-  track.addNote({ midi: clamp(note, 21, 108), time, duration: Math.max(0.08, duration), velocity });
-}
-
-function onsets(notes) {
-  const grouped = new Map();
-  for (const note of notes) {
-    const key = Math.round(note.time * 50);
-    const list = grouped.get(key) ?? [];
-    list.push(note);
-    grouped.set(key, list);
-  }
-  return [...grouped.entries()].sort(([a], [b]) => a - b).map(([key, group]) => ({ time: key / 50, notes: group }));
-}
-
-const manifest = [];
-for (const item of catalog) {
-  const name = item.name;
-  const [series, numberText] = name.split('-');
-  const number = Number(numberText);
-  const source = new Midi(fs.readFileSync(path.join(sourceRoot, `${name}.mid`)));
-  const rdf = fs.readFileSync(path.join(sourceRoot, `${name}.rdf`), 'utf8');
-  const license = field(rdf, 'licence');
-  if (license !== 'Public Domain' && !/^Creative Commons Attribution-ShareAlike (2\.5|3\.0)$/.test(license)) {
-    throw new Error(`${name}: 권리 표시를 확인해야 합니다: ${license}`);
-  }
-  const nonempty = source.tracks.filter((track) => track.notes.length);
-  if (nonempty.length < 2) throw new Error(`${name}: 양손 원본이 없습니다`);
-  const rightSource = onsets(nonempty[0].notes);
-  const leftSource = onsets(nonempty.at(-1).notes);
-  const speed = Math.max(1, 58 / source.duration);
-  const introSeconds = 5.4;
-  const target = new Midi();
-  target.header.setTempo(120);
-  target.header.timeSignatures.push({ ticks: 0, timeSignature: source.header.timeSignatures[0]?.timeSignature ?? [4, 4] });
-  const right = target.addTrack();
-  right.name = 'Right Hand';
-  const left = target.addTrack();
-  left.name = 'Left Hand';
-
-  // 원곡의 첫 선율 네 음을 먼저 천천히 들려준다. 본곡과 자연스럽게 이어지는 도입부다.
-  const introPitches = rightSource.slice(0, 4).map((group) => Math.max(...group.notes.map((note) => note.midi)));
-  const firstBass = Math.min(...leftSource[0].notes.map((note) => note.midi));
-  addNote(left, firstBass, 0, 4.5, 0.48);
-  introPitches.forEach((pitch, index) => addNote(right, pitch, 0.55 + index * 1.05, 0.83, 0.55 + index * 0.04));
-
-  // 오른손은 원곡의 각 시작점에서 가장 높은 성부를 택한다. 선율의 순서와 리듬을 보존한다.
-  for (const group of rightSource) {
-    const note = group.notes.reduce((highest, current) => current.midi > highest.midi ? current : highest);
-    addNote(right, note.midi, introSeconds + group.time * speed, Math.min(2.4, note.duration * speed * 0.92), clamp(note.velocity, 0.48, 0.87));
-  }
-  // 왼손은 저음을 따라가되 가까운 시작점을 정리해 초보자가 양손을 맞출 여유를 둔다.
-  let previousBassTime = -10;
-  for (const group of leftSource) {
-    const time = introSeconds + group.time * speed;
-    if (time - previousBassTime < 0.48) continue;
-    const note = group.notes.reduce((lowest, current) => current.midi < lowest.midi ? current : lowest);
-    addNote(left, note.midi, time, clamp(note.duration * speed * 0.9, 0.38, 2.5), 0.53);
-    previousBassTime = time;
-  }
-
-  // 원곡 마지막 선율을 늦추어 다시 들려준 뒤 종지음을 충분히 유지한다.
-  const endingStart = introSeconds + source.duration * speed + 0.5;
-  const endingPitches = rightSource.slice(-3).map((group) => Math.max(...group.notes.map((note) => note.midi)));
-  const lastBass = Math.min(...leftSource.at(-1).notes.map((note) => note.midi));
-  addNote(left, lastBass, endingStart, 5.1, 0.52);
-  endingPitches.forEach((pitch, index) => addNote(right, pitch, endingStart + index * 1.05, index === 2 ? 3.0 : 0.85, 0.68 - index * 0.06));
-
-  const file = `practice-${name}.mid`;
-  const duration = new Midi(target.toArray()).duration;
-  if (duration < 60 || right.notes.length < 12 || left.notes.length < 6) throw new Error(`${name}: 연습곡 검증 실패`);
-  const notesPerSecond = right.notes.length / duration;
-  const difficulty = notesPerSecond < 2.1 ? 'beginner' : notesPerSecond < 3.5 ? 'easy' : 'intermediate';
-  fs.writeFileSync(path.join(outputRoot, file), Buffer.from(target.toArray()));
-  const title = `${series === 'burgmuller' ? '부르크뮐러 25곡' : '슈만 어린이를 위한 앨범'} ${number}번 ${names[series][number - 1]}`;
-  manifest.push({
-    storage_name: file,
-    title,
-    artist: series === 'burgmuller' ? '요한 프리드리히 부르크뮐러' : '로베르트 슈만',
-    description: `${field(rdf, 'title')} 원곡을 양손 연습용으로 단순화했습니다. 도입부와 마무리가 포함된 전체 곡입니다. 원본: Mutopia Project ${field(rdf, 'id')}. 조판: ${field(rdf, 'maintainer')}. ${license}${license === 'Public Domain' ? '' : ' 동일 조건 편곡'}.`,
-    difficulty,
-    genre: series === 'burgmuller' ? '낭만주의 연습곡' : '낭만주의 소품',
-    arrangement: 'piano_solo',
-    tags: ['양손', '도입부', '마무리', series === 'burgmuller' ? '부르크뮐러' : '슈만', difficulty === 'beginner' ? '입문' : difficulty === 'easy' ? '쉬움' : '중급', license === 'Public Domain' ? '공개 도메인' : 'CC BY-SA'],
-    source_url: item.midi_url,
-    rdf_url: item.rdf_url,
-    source_title: field(rdf, 'title'),
-    source_id: field(rdf, 'id'),
-    maintainer: field(rdf, 'maintainer'),
-    license,
-    duration_seconds: Math.round(duration * 10) / 10,
-  });
-}
-fs.writeFileSync(path.join(outputRoot, 'practice_collection.json'), `${JSON.stringify(manifest, null, 2)}\n`);
-console.log(`연습곡 ${manifest.length}개 생성. 재생 길이 ${Math.min(...manifest.map((item) => item.duration_seconds))}~${Math.max(...manifest.map((item) => item.duration_seconds))}초`);
diff --git a/scripts/check_practice_collection.mjs b/scripts/check_practice_collection.mjs
deleted file mode 100644
index 8acbf66..0000000
--- a/scripts/check_practice_collection.mjs
+++ /dev/null
@@ -1,35 +0,0 @@
-import fs from 'node:fs';
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-import midiPackage from '../frontend/node_modules/@tonejs/midi/build/Midi.js';
-
-const { Midi } = midiPackage;
-const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..', 'backend', 'sample_midi');
-const collection = JSON.parse(fs.readFileSync(path.join(root, 'practice_collection.json'), 'utf8'));
-if (collection.length !== 30 || new Set(collection.map((item) => item.title)).size !== 30) {
-  throw new Error('서로 다른 제목의 연습곡 30개가 필요합니다');
-}
-const motifs = new Set();
-for (const item of collection) {
-  const midi = new Midi(fs.readFileSync(path.join(root, item.storage_name)));
-  const [right, left] = midi.tracks;
-  if (midi.tracks.length !== 2 || right.notes.length < 12 || left.notes.length < 6) {
-    throw new Error(`${item.storage_name}: 양손 음표가 부족합니다`);
-  }
-  if (midi.duration < 60 || midi.duration > 180) {
-    throw new Error(`${item.storage_name}: 곡 길이가 기준을 벗어납니다`);
-  }
-  if (right.notes[0].time < 0.4 || right.notes[4].time < 5 || left.notes[0].time !== 0) {
-    throw new Error(`${item.storage_name}: 도입부를 확인해야 합니다`);
-  }
-  if (midi.duration - right.notes.at(-1).time < 2.5 || midi.duration - left.notes.at(-1).time < 4) {
-    throw new Error(`${item.storage_name}: 마무리 지속 시간이 부족합니다`);
-  }
-  const motif = right.notes.slice(4, 20).map((note) => note.midi).join('-');
-  if (motifs.has(motif)) throw new Error(`${item.storage_name}: 다른 곡과 선율이 같습니다`);
-  motifs.add(motif);
-  if (![...right.notes, ...left.notes].every((note) => note.midi >= 21 && note.midi <= 108)) {
-    throw new Error(`${item.storage_name}: 피아노 음역을 벗어났습니다`);
-  }
-  console.log(`${item.storage_name}: ${midi.duration.toFixed(1)}초, 오른손 ${right.notes.length}음, 왼손 ${left.notes.length}음`);
-}
diff --git a/수정기록.txt b/수정기록.txt
index febfa7c..fb47c8c 100644
--- a/수정기록.txt
+++ b/수정기록.txt
@@ -54,3 +54,10 @@
 - 운영 DB와 기존 MIDI 파일과 수정 대상 소스는 /home/syskiller/piano/backups/bach-to-basics/20261009-practice-30-intro-ending 에 백업했다. 백엔드 컨테이너만 다시 빌드했다.
 - HTTPS 첫 화면과 비회원 목록에서 새 공개 곡 30개 및 각 MIDI 파일의 다운로드를 확인했다. 기존 회원 업로드 2건을 보존했다.
 - 실제 건반을 연결해 곡별 연주감과 USB MIDI 입력을 확인하는 작업은 남아 있다.
+
+2026-10-09
+
+- 사용자 요청과 맞지 않는 부르크뮐러와 슈만 기본 연습곡 30개를 철회했다. 생성 MIDI와 원본 자료 및 생성·검사 스크립트를 제거했다.
+- 기본 자료 제외 목록에 30곡 파일명을 정확히 지정해 서버 재시작 뒤에도 다시 등록되지 않게 했다. 회원 업로드와 기존 기본 샘플 7개는 유지했다.
+- 철회 직전 DB와 MIDI 파일 및 원본 자료는 /home/syskiller/piano/backups/bach-to-basics/20261009-withdraw-practice-30 에 백업했다. 격리 환경 백엔드 테스트 5개를 통과했다. 운영 백엔드만 갱신했다.
+- 재시작 뒤 HTTPS 비회원 목록에서 철회곡 0건을 확인했다. DB 철회곡 0건과 해당 MIDI 파일 0개 및 회원 업로드 2건과 기존 기본 샘플 7개를 확인했다.