Rythm.js is a javascript library that makes your page dance.
This library is currently in development.
Loud links is a simple tiny Javascript library to add interaction sounds to your website. The library creates HTML5 audio element and uses it to play mp3/ogg audio files which is currently supported in all browsers.
jWebAudio is a JavaScript Web Audio library designed for web games with both jQuery version and standard version.
Features
Ion.Sound is a jQuery plugin for playing sounds on events. Ion.Sound is afreeto use and has cross-browser support. It includes 15 free sounds.