Vision Factory + Ableton Live.
Music by Sevenfive.

v3ga.net/blog/category/visionfactory/
splankstudio.com/

Synchronization is done through midi, with a complete events driven scheme written in javascript. Integration of the scripting layer in Vision Factory starts to be interesting as it's now possible to parametrize animations completely from within a single script.
Speaking of the animation itself, the whole thing looks like a bit too flat though and the bindings with midi messages should be reworked as it feels a bit cranky.