I’ve been a fan of Golan Levin‘s work for quite a while, and I just saw this link to an amazing work he has done with Zach Lieberman.

Messa di Voce (Ital., “placing the voice”) is an audiovisual performance in which the speech, shouts and songs produced by two abstract vocalists are radically augmented in real-time by custom interactive visualization software. The performance touches on themes of abstract communication, synaesthetic relationships, cartoon language, and writing and scoring systems, within the context of a sophisticated, playful, and virtuosic audiovisual narrative.

There are some amazing videos on the site, definitely worth watching all of them.