Wavesurfer.js
Navigable waveform built on Web Audio and Canvas
Tuna
An audio effects library for Web Audio, made by www.dinahmoe.com
Midi Writer Js
♬ JavaScript library providing an API for programmatically generating expressive multi-track MIDI files in browser and Node.
Jsmediatags
Media Tags Reader (ID3, MP4, FLAC)
Alpha Tab
alphaTab is a cross platform music notation and guitar tablature rendering library.
Wad
Web Audio DAW. Use the HTML5 Web Audio API for dynamic sound synthesis. It's like jQuery for your ears.
Pedalboard.js
Open source JavaScript framework for developing audio effects for guitars using the Web Audio API.
Flocking
Flocking - Creative audio synthesis for the Web
Pizzicato
Library to simplify the way you create and manipulate sounds with the Web Audio API.
Audio5js
The HTML5 Audio Compatibility Layer
Howler.js
Javascript audio library for the modern web.
Speak.js
Text-to-Speech in JavaScript using eSpeak
Vexflow
A JavaScript library for rendering music notation and guitar tablature.
Webaudio.js
web audio library for games
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.
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.
Audio.js
A cross-browser javascript wrapper for the html5 audio tag