SuperCollider – Environment and Programming Language for Real Time Audio Synthesis and Algorithmic Composition
http://supercollider.sourceforge.net/

SuperCollider is an environment and programming language for real time audio synthesis and algorithmic composition. It provides an interpreted object-oriented language which functions as a network client to a state of the art, realtime sound synthesis server. SuperCollider was written by James McCartney (audiosynth.com) over a period of many years. It is now an open source GPL’d project maintained and developed by James and various others. It is used by musicians, scientists, and artists working with sound. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.