I love it when musical and computational composition get paralleled. I just saw a different talk focused on this theme recently, focusing on Goldberg variations using the Overtone library in Clojure. You actually get to hear things build up as you see the code do the same in this one, really cool.

video: http://skillsmatter.com/podcast/home/functional-composition

repo: https://github.com/ctford/goldberg

(edited to add the video link)