# m4a (Music4All Archive Package)

This dataset repo stores the encrypted `music4all.zip` archive as split parts, plus integrity and structure manifests.

## Dataset Introduction

- Related open dataset: [MTG Jamendo Dataset](https://github.com/MTG/mtg-jamendo-dataset.git)

## Repository Layout

- `raw/music4all.zip.part-000` ... `raw/music4all.zip.part-005`
- `metadata/source_archive_sha256.txt`
- `metadata/source_archive_size_bytes.txt`
- `metadata/parts_manifest.tsv`
- `metadata/parts_sha256.txt`
- `metadata/summary.json`
- `metadata/zip_entries.txt`
- `metadata/subdir_counts.tsv`
- `metadata/ext_counts.tsv`
- `metadata/pairing_report.json`
- `metadata/reassemble.sh`

## Source Archive Facts

- Source archive: `music4all.zip`
- Size: `51,727,515,191` bytes
- SHA256: `b4b9f3ade16c09b70f48a387dddf3cf16a4454e33a4e597055643817ce5ca973`
- Total ZIP entries: `218,548`
- Encrypted entries: `218,545`

## Internal Content Summary (from ZIP index)

- `music4all/audios/`: `109,269` MP3 files (+ directory entry)
- `music4all/lyrics/`: `109,269` TXT lyric files (+ `readme.txt` and directory entry)
- Root CSV files (`6`):
  - `id_genres.csv`
  - `id_information.csv`
  - `id_lang.csv`
  - `id_metadata.csv`
  - `id_tags.csv`
  - `listening_history.csv`
- Audio/Lyric pairing check:
  - audio ids: `109,269`
  - lyric ids: `109,269`
  - only-audio: `0`
  - only-lyric: `0`

## Reassemble and Verify

```bash
cd metadata
bash reassemble.sh
```

This reconstructs `../music4all.zip` and verifies SHA256 using `source_archive_sha256.txt`.

## Notes

- The ZIP is password-protected. This repo preserves the encrypted source package and machine-readable manifests.