Jeff Minter experimented with fractal music in his 90s Camels game for the Konix. I've always been really partial to that approach, using the natural beauty of a fractal to make stuff for humans. I also like the idea of a background bassline and other song-global settings like tempo and key.
Nice info there. I just googled it, I guess this might be what you're referring to?
(music starts about halfway through)
Has a very interesting ambiance to it, with all those relentless arpeggios which still sound somewhat dreamlike. I like it.
In other news, I just got a prototype of a genetic algorithm composer working on my second attempt (the first one was really borked and didn't produce much of value). I only use it for the melodic rhythm so far, not the note pitches, but I feel that it already creates somewhat more structured melodies than my previous attempts. Seems really promising. It also converges pretty fast. I'll have to tune it a bit more, though for the rest of the day I'm afraid I'll have to do some serious work.