Here’s an interesting project that Gabriel G aka AlphaCore is doing. He is coding live using the Ruby programming language to create MIDI events, which are then played through Tweet A Sound.

If you are interested in this kind of stuff, Gabriel has shared his work on the live Ruby music system:

The 3 required files (released on Pastie.org for free):
Music.rb
scales.rb
Song_player.rb

Software:
Midipatch Bay
Tweet a Sound

And of course, check out his site: Alphacore