Piano samples: Salamander Grand Piano by Alexander Holm.
License: Creative Commons Attribution 3.0 https://creativecommons.org/licenses/by/3.0/
Source: https://github.com/Tonejs/audio/tree/master/salamander
Nine MP3 samples, unchanged from the Tone.js distribution. Nearby pitches are resampled during playback.
Fonts: Lato by the Lato Project Authors, SIL Open Font License 1.1. See /fonts/OFL.txt.
Source: https://github.com/google/fonts/tree/main/ofl/lato