Note frequencies in JavaScript with MUSIC.js

MUSIC.js is a music creation library containing functions and data sets to generate notes, intervals, chords, and scales.

With the new client-side script APIs (Firefox’s Audio Data API and Webkit’s Web Audio API) we have the ability to do audio synthesis (generate sound) with javascript. MUSIC.js is designed to make it easier to do audio synthesis with javascript by providing functionality for frequency calculations and transposing notes.

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Greg Jopa

Web developer and musician. Passionate about the open web.


Web Developer


Chicago, Illinois