Much easier than having the audience learn a musical instrument. Makes me really want to get that theremin now though. What other instruments can you play without actually touching it?
"...Freeman is creating a work in which a restless audience is very literally part of the music. Listeners and musicians are encouraged to wander around the performance space during the concert, while digital cameras track their motion.
Those movements are fed into a software simulation, and Freeman's algorithms, using parameters such as distance from performers, speed and "sheepiness," use the data to dynamically create a score on Pocket PCs attached to the musicians' instruments. Wave a hand, or run around the room, and you'll almost immediately hear the results.
"It's part inspired by a cocktail party, and part by a dance club environment," Freeman said. "Even in part by a multiplayer game, where people are in competition to influence the music by convincing people to follow them."