My first appreciation of generative art might have been the Streets of Rage 3 OST, even if I didn't know it at the time. Composer Yuzo Koshiro utilized a tool he called "Automated Composing System" to procedurally generate a bunch of random sequences, in an attempt to make sounds that haven't been heard before. He picked the ones he liked the best and incorporated them into the tracks.

https://www.youtube.com/watch?v=HmV_r_s6JgE&list=PLE1355A8B1...