Well, the sounds are various instruments lying around my room — Singing Bowl, Cello, Piano, Glock, Euphonium, etcetera. I sampled these instruments, and then wrote a computer program that writes music using these samples. I made this program to experiment with "recursive procedural time."
What the hell is that?
It's a way of controlling the passage of time that can create the illusion of speeding-up or slowing-down.. forever. It can do other interesting things too, but let's keep it simple for now.