alphaTab is a cross platform music notation and guitar tablature rendering library.
The Web Audio API, developed by the W3C Audio WG
Navigable waveform built on Web Audio and Canvas
Library to simplify the way you create and manipulate sounds with the Web Audio API.
Media Tags Reader (ID3, MP4, FLAC)
Web Audio DAW. Use the HTML5 Web Audio API for dynamic sound synthesis. It's like jQuery for your ears.
Web Audio Library