Sonic Pixels - An Essay on Music and Motion in Three Parts

Essay Part Three by Mark Webster

Excellent Essay, also worth checking out are his two other essays
Part 1 - Colour is the keyboard and
Part 2 - Rhythm in Motion

Wolfram Tones: An Experiment in a New Kind of Music

http://tones.wolfram.com/

"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. "
This is really fun to play with....!!! Amazing composition controls in terms of a huge variety of musical scales