Would be nice to have something to generate an endless music stream. I mean, there are a lot of patterns in music. Chord sequences, scales, harmonics, equalizers, various other things. Like you could use something like /dev/random, you map entropy into chord sequences, maybe set up multiple "instruments", route everything through an audio processor etc. I want to learn more about music physics to do something like that.
Note:
@orhun's linuxwave is cool, but needs a lot of manual processing