Ok, well it's not all robots, but still cool none the less. Very hypnotic sound

Here's what BotJunkie had to say about it:

The band consists of 3 humans up front and 3 robots in back. Not only do they have a robot guitarist, they also sport a robo-drummer. But the real star of the show would have to be the robot vocalist. Maywa Denki, (the artist) who has created an actual singing robot, thanks to a large mechanical bellows and a computer-controlled rubber vocal chord.