SoundManager 2 is an attempt at providing the sound API which Javascript has been missing. It’s a Javascript library which wraps and extends Flash’s sound capabilities, bringing cross-platform audio functionality to Javascript. SoundManager 2 was written to meet a desire to have Javascript-driven sound for interactive web-based projects. It is free for use in both personal and commercial projects. View / hear some of the examples of Javascript-driven sound, and applications implementing SoundManager 2. They are really impressive.

Requirements: Flash 8+
Demo: http://schillmania.com/projects/soundmanager2/
License: BSD License