Java

Links:

JSyn - Java Audio Synthesis - Develops interactive sound effects, audio environments, or music, for embedding in web pages.
JavaTuner - Tunings and Temperaments -- Demo Applet
Modulator Jane - Modulator Jane is a java applet that uses standard AU sound files to modulate graphics on a web page. The effect is that of a light show corresponding to the sound or music played.
SoftSynth.com - Computer Music and Synthesis Software. A Java API for soft synthesizers, with a good page of links. Strictly for the programmers though.

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