What is it?
Tone.js is a Web Audio library which wraps and (hopefully) simplifies some of the Web Audio API.
The focus of Tone is on making interactive music:
* Musical timing - `"4n"`, `"8n"`, `"1:4:2"`, `"2m + 4t"`
* Musical notation - `"C4"`, `"Db4"`, `440`, `"440hz"`