Prog is a a downloadable tool for generating random music, which can be exported as .mid or .wav files for use elsewhere.

It's also got its own visualiser:

It started off as an attempt to introduce generated music into another project, but somehow the test environment became an app in its own right, and the generator doesn't fit the needs of the other project anyway. So I'm releasing it as-is in the hope that someone else will have at least a little fun with it.