GuitarFakeBook backing-track instrument samples
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assets/samples/piano/*.mp3   Acoustic Grand Piano      (15 notes, Eb2-A5, every 3 semitones)
assets/samples/guitar/*.mp3  Acoustic Guitar (steel)   (13 notes, E2-E5, every 3 semitones)
assets/samples/bass/*.mp3    Electric Bass (finger)    (12 notes, E1-Db4, every 3 semitones)

Source: "FluidR3_GM" soundfont by Frank Wen, as pre-rendered to MP3 by Benjamin Gleitzman
in midi-js-soundfonts: https://github.com/gleitz/midi-js-soundfonts (FluidR3_GM/<instrument>-mp3/<note>.mp3)
The rendered FluidR3_GM sounds are released under the Creative Commons Attribution 3.0 license:
https://creativecommons.org/licenses/by/3.0/us/
The files here are unmodified copies of the published MP3s (fetched 2026-10-17; 40 files, about 0.8 MB). GuitarFakeBook
re-pitches them in the browser to play other notes.

midi-js-soundfonts repository code: Copyright (C) 2012 Benjamin Gleitzman, MIT License.