Audio-driven animation.
Trapcode Particular v2 controlled by Sound Keys. I used some setups from the "Massive" collection and hooked them up so the position of the emitters are controlled by various aspects of the audio.
Particular v2 "Massive" collection - 15 pre-made AE comps:
trapcode.squarespace.com/sharelog/2009/12/28/particular-v2-massive.html
Music, Software and Design by Peder Norrby / Trapcode / Rymden