I always liked the idea of coding music. Programmatically making some awesome tracks. Then open source it and let people run it on what ever they want.
It wasn't exactly a hit, but then again promotion is the hard part. I'm finishing a lengthy write-up on the process, which focuses more on harmony (specifically freestyle just intonation) rather than programming. I believe the programming portion is highly personal, so it's more interesting to share general composition techniques that apply well to algorithmic music.
Executable music is also an established genre in the demoscene, but the music is typically written in trackers rather than with code. The extremely small intro categories do have fully algorithmic music, which can be really inspiring. That said the size limit often forces the sound into a "bytebeat" style, so I'd say size-unrestricted algorithmic music ends up being a rare genre that's not even found in the demoscene (as far as I know! I'd love to find more music like this).
Yeah I normally don't make any music, but I really like glicol. A while ago the author of glicol 'shilled' it on HN, and I was really blown away by the demo tracks, for example:
