MrScorcher1/tonic-trainer

Tonic Trainer clips

3094 thirty-second music clips with human-made key annotations, for ear training. Each clip is the opening 30 seconds of a Free Music Archive track, re-encoded to mono 128 kbps.

Licensing — read this first

The audio is not ours and is not uniformly licensed. Every clip is redistributed under the original Creative Commons terms of its own track, which are recorded per file in attribution.csv. Nothing here is public domain by default, and this dataset card's own license field cannot override a track's.

• Tracks under any NoDerivatives licence are excluded — slicing a clip out of one would be a derivative work.
• NonCommercial tracks are included and flagged; respect the NC terms.
• Attribution is mandatory. Artist, title and licence for every clip are in attribution.csv, and any application built on this must display them.

licence	clips
CC BY	256
CC BY-NC	535
CC BY-NC-SA	2175
CC BY-SA	94
CC0-1.0	23
Public Domain	11

Licence resolution was cross-checked against 3599 tracks using FMA's tracks.csv (authoritative) and the mp3s' embedded ID3 tags; 503 were excluded on conflict or an ND signal. See license_conflicts.json.

Contents

file	what it is
clips/NNN/NNNNNN.mp3	30 s mono clip, named by FMA track id
attribution.csv	id, title, artist, licence, genre — one row per clip
puzzles_public.json	clip metadata without the answers
license_conflicts.json	licence cross-check output

puzzles_public.json deliberately omits tonic_pc, mode and key_display so the answers are not trivially scrapeable by anyone playing the game.

Sources

• Audio: Free Music Archive, via the FMAK package (CC BY 4.0 for the compilation; per-track licences govern the audio).
• Key annotations: fma_keys — human-annotated, ISMIR 2023 late-breaking demo by Stella Wong. Single annotator, lightly reviewed; labels are good but not cross-checked.

Known limitations

• Clips are openings, so the material is whatever the track starts with.
• The key distribution is lopsided toward C major and A minor.
• FMA skews independent and electronic; some tracks have no clear tonal centre.