Sources and credits
The training audio was created by rendering scores with the instrument sources below and constructing mixtures from recorded notes. Source licenses apply to the corresponding material; this collection does not replace them with one blanket license.
Synthetic instrument sources
| Source | Sound identities | Terms recorded for the source |
|---|---|---|
| Adventure Kid Waveforms | 2000 | CC0-1.0 |
| Aquanode Soundscapes | 164 | CC0-1.0 |
| Bengt Nilsson — Headroom Piano | 2 | CC-BY-4.0 |
| Bobby Blues DX7 patches | 1983 | Public-Domain-patches; GPL-3.0-Dexed-renderer |
| D. Smolken Double Bass | 3 | CC0-1.0 |
| Fluid R3 GM — Frank Wen and Toby Smithe | 126 | MIT |
| GeneralUser GS — S. Christian Collins | 182 | GeneralUser-GS-custom |
| Helm factory presets | 163 | CC-BY-4.0 |
| Ixox Flute | 1 | CC-BY-4.0 |
| Steel Drum — Jeff Learman | 2 | Unlicense |
| LMMS authored presets | 447 | GPL-2.0 |
| MTG Solo Sax | 2 | CC-BY-4.0 |
| Mxm40b Vital presets | 92 | Unlicense |
| Nahush Vitalium presets | 162 | GPL-3.0 |
| NSynth — Google Magenta | 839 | CC-BY-4.0 |
| Odin2 factory presets — TheWaveWarden and contributors | 134 | GPL-3.0-or-later |
| Osiris Piano | 2 | CC0-1.0 |
| Surge XT factory/community presets | 1969 | GPL-3.0 |
| TinySOL | 13 | CC-BY-4.0 |
| Vaporizer2 factory presets — VAST Dynamics and contributors | 334 | GPL-3.0 |
| OB-Xd authored banks — Zynthian contributors | 1380 | GPL-3.0-data; GPL-2.0-renderer |
License texts are in licenses/. Preset names and original sound identifiers are in sources/instruments.jsonl. Helm preset authors are Cris Owl Alvarez, Matt Tytel, Mikolis, Ones & Zeros, SF and Sf; individual credits are in sources/helm-presets.json.
Odin2 source version 265e9e227581357efb87ed7217381f8a40c5e2bf is included in sources/Odin2-265e9e227581357efb87ed7217381f8a40c5e2bf.tar.gz. Source versions for the other pinned preset collections are listed in sources/versions.json.
Scores
The score excerpts are drawn from the datasets below. Scores were cropped, transposed where applicable, and rendered with the instruments above; the resulting audio is newly rendered, rather than copied from these score datasets. Source identifiers and timings remain in the data indexes.
| Dataset | Creators | Terms |
|---|---|---|
| CocoChorales | Yusong Wu, Josh Gardner, Ethan Manilow, Ian Simon, Curtis Hawthorne and Jesse Engel | CC BY 4.0 |
| Slakh2100 | Ethan Manilow, Gordon Wichern, Prem Seetharaman and Jonathan Le Roux | CC BY 4.0 |
| MAESTRO | Curtis Hawthorne, Andriy Stasyuk, Adam Roberts, Ian Simon, Cheng-Zhi Anna Huang, Sander Dieleman, Erich Elsen, Jesse Engel and Douglas Eck | CC BY-NC-SA 4.0 |
| GuitarSet | Qingyang Xi, Rachel M. Bittner, Johan Pauwels, Xuzhou Ye and Juan P. Bello | CC BY 4.0 |
| MAPS | Valentin Emiya and Bertrand David | CC BY-NC-SA 2.0 France |
| URMP | Bochen Li, Xinzhao Liu, Karthik Dinesh, Zhiyao Duan and Gaurav Sharma | Research score annotations; YourMT3 distribution, source terms retained |
Noncommercial and share-alike terms continue to apply to material derived from the corresponding sources. The collection is not offered as unrestricted commercial-use audio.
Recorded instrument sources
Recorded notes were cropped, resampled, selected by pitch and duration, and mixed according to the score excerpts. Original source and note identifiers remain in the indexes.
| Source | Credit | Terms |
|---|---|---|
| RWC Musical Instrument Sound Database, 2026 re-release | Masataka Goto, Stefan Balke, Meinard Mueller and original RWC contributors | CC BY-NC 4.0 |
| GoodSounds | Music Technology Group, Universitat Pompeu Fabra, and GoodSounds performers | CC BY-NC 4.0 |
| EGFxSet | Hegel Pedroza, Gerardo Meza and Iran R. Roman | CC BY 4.0 |
| Bigcat Cello | Kamila Borowiak and Karoryfer / D. Smolken | CC0 1.0 |
| TinySOL | Carmine-Emanuele Cella, Daniele Ghisi, Vincent Lostanlen, Fabien Levy, Joshua Fineberg and Yan Maresz | CC BY 4.0 |
| Spanish Classical Guitar | FreePats contributors | CC0 1.0 |
| Fashionbass, Growlybass and Sneakybass | Karoryfer / D. Smolken and library contributors | CC0 1.0 |
| Ethan's Cello | Ethan Winer; SFZ conversion by Kinwie | Royalty-free use grant in licenses/ethan-winer.txt |
| VCSL | Versilian Studios / Sam Gossner and contributors | CC0 1.0 |
| VSCO 2 Community Edition | Versilian Studios / Sam Gossner and contributors | CC0 1.0 |