They defuse bombs, help decontaminate nuclear power plants, even vacuum the living room floor. One thing you don't see robots doing, though, is jamming with a live, human orchestra. But on Thursday, the KarmetiK Machine Orchestra (the name is short for karma and kinetic) will take to the stage at the Valencia-based California Institute of the Arts, where MahaDeviBot, GlockenBot and a handful of their cyber-friends - NotomotoN and BreakBot are on drums - have been making music with a dozen human musicians. Ajay Kapur, a musician with a doctorate in electrical engineering who heads the music technology program at the school co-founded by Walt Disney, and Michael Darling, who runs CalArts' theater arts program, built the robots out of everything from leftover theater props to broken furniture. Then they filled their little robot brains with open-source code that allows the machines to read programmed musical compositions and play different scores.