I missed putting a post up on this when I first saw it as I thought it was just a site to make ringtones. Turns out you can do that and a lot more. "WolframTones works by taking simple programs from Wolfram's computational universe, and using music theory and Mathematica algorithms to render them as music. Each program in effect defines a virtual world, with its own special story--and WolframTones captures it as a musical composition."
via Doktor Future:
"I've used Mathematica for about 15 years now and have even used it as a synthesizer ala csound and even metasynth. It has functions built in for convolution, FFT's, and all sorts of stuff. Want an oscillator? just make a matrix with SIN's. It plays audio too. It can also be used to read and write MIDI! Not too shabby for a 'math' package :)
Here's a list of some of the 'notebooks' you can download to do this sort of stuff: link
(the list is interesting, but you need Mathematica to do anything in it)
There are few programs in the world as comprehensive as Mathematica. I went down to Champaign Illinois and visited their HQ in fall of last year.
Oh, and here's a really dull help file that shows you how to make a scale, and do stuff like play a perfect 5th.
link
It's texty, not sexy :)"
