I was working on a variation on this piece, and listening to Django Reinhardt, and I thought "wow, it looks like my particles are dancing".
After searching, I found Doug Martin (jazz guitarist) and asked if I could use his music. He said yes!
In the rendered piece, the particles just happen to move as if to the music, but they're not responding to it. If I were to revisit, I'd program in some responses to the audio. Just a little bit.