Playing with human musicians, robots get their groove on at the California Institute of the Arts

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They can defuse bombs, help decontaminate nuclear power plants and even vacuum the living room floor without bashing into the furniture or knocking over a vase.

One thing you don’t see robots doing, though, is jamming with a live, human orchestra. Breaking into a 12-bar solo is something that is still pretty much the province of people.

Except at the California Institute of the Arts, where MahaDeviBot, GlockenBot, BreakBot and a handful of their cyberfriends have been making music with students in the small private school’s music and theater arts classes.

For months, a dozen human musicians and a near-equal number of robots had been getting their groove on in anticipation of a concert Thursday night at the school’s Walt Disney Modular Theater.

“It’s like a symbiotic relationship between humans and machines,” said Ajay Kapur, a musician with a doctorate in electrical engineering who heads the music technology program at the school, co-founded by Walt Disney. “There’s a lot more interaction between the humans and the machines than just one person programming the robots and pushing the play button.”

As he spoke, students and bots were frantically preparing for their concert. Tammy, a robot marimba player, fiercely shook her bells as two of the orchestra’s drummers, NotomotoN and BreakBot, laid down a raucous beat. Their selections ran toward a melodic fusion of jazz, hip-hop, electronica and world music composed by Mr. Kapur and the students.

The concert was essentially four years in the making, beginning the day Mr. Kapur, a jazz-trained sitar player, arrived at the school in the picturesque hillside country just north of Los Angeles. He had come on a mission: to create a full-blown orchestra composed equally of people and robots, with trained musicians manipulating and instructing the bots.

He and Michael Darling, who runs CalArts’ theater arts program, set about recruiting the musicians from their classes and building the robots out of items including leftover theater props and broken furniture. Then they filled their little robot brains with open source code that allows the machines to read programmed musical compositions and play scores.

“We forage a lot of stuff,” Mr. Darling said. “We have to buy some stuff, but we also scour electrical junkyards all over the Los Angeles area.”

As he spoke, he stood on stage next to Tammy. The bot, which stands several feet tall, was built with an old swivel chair, a collection of small abandoned bells and things that look like old plumbing fixtures. Tammy may not be much to look at with her one Cyclops eye that Mr. Darling added for a laugh, but fire her up with a jolt of electricity and she plays some mean marimbas.

Put her with the others and, ladies and gentlemen, you have the KarmetiK Machine Orchestra (the name is short for karma and kinetic).

The players are not the world’s first accomplished musician-robots. One that flawlessly plays “Flight of the Bumblebee” on a flute, faster than any human can, was built a few years ago at Japan’s Waseda University. But it’s simply a soloist that only repeats what it has been programmed to play.

Jazz guitarist Pat Metheny took a robot orchestra on the road with him last year in support of his album “Orchestrion.” But the bots played preprogramed compositions while Mr. Metheny improvised on guitar.

“I’m pretty sure we’re the first full-on orchestra,” Mr. Kapur said.

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