Data sources and licenses

• chords-db by David Rubert. Guitar and ukulele chord voicings, MIT License.
• Notes, intervals, piano voicings and inversions, scales, keys and progressions are calculated by HandyChords from standard music theory.
• All sounds are synthesized in your browser with the Web Audio API. No recordings are used.

Fonts

Inter and Bricolage Grotesque, both under the SIL Open Font License, served through Google Fonts.