Alpha Tab
alphaTab is a cross platform music notation and guitar tablature rendering library.
Jsmediatags
Media Tags Reader (ID3, MP4, FLAC)
Wavesurfer.js
Navigable waveform built on Web Audio and Canvas
Web Audio Api
The Web Audio API, developed by the W3C Audio WG
Midi Writer Js
♬ JavaScript library providing an API for programmatically generating expressive multi-track MIDI files in browser and Node.
Midi.js
Making life easy to create a MIDI-app on the web. Includes a library to program synesthesia into your app for memory recognition or for creating trippy effects. Convert soundfonts for Guitar, Bass, Drums, ect. into code that can be read by the browser. Supports multiple simultaneous instruments and perfect timing.
Pizzicato
Library to simplify the way you create and manipulate sounds with the Web Audio API.
Tone.js
A Web Audio framework for making interactive music in the browser.
Tuna
An audio effects library for Web Audio, made by www.dinahmoe.com
Vexflow
A JavaScript library for rendering music notation and guitar tablature.
Mp3.js
A JavaScript MP3 decoder for Aurora.js
Sound JS
A Javascript library for working with Audio. Features a simple interface as the front end to multiple audio APIs via a plugin model. Currently supports HTML5 Audio & Flash.
Flocking
Flocking - Creative audio synthesis for the Web
Waud
Web Audio Library
Audiolet
A JavaScript library for real-time audio synthesis and composition from within the browser
Timbre.js
JavaScript library for objective sound programming
Speak.js
Text-to-Speech in JavaScript using eSpeak