the Toa Mata Band

The Toa Mata Band by Italian music producer Giuseppe Acito is a fully working music band made up of several tiny robotic LEGO figures, programmed to play various electronic instruments.
Each “member” of the band is constructed from LEGO Bionicle pieces rigged with rubber bands and pulleys. Their arms are controlled by an Arduino Uno connected to an iPad running Nord Beat, a MIDI sequencer app. The tiny bots essentially perform a MIDI sequence by hitting the instrument they’re facing when prompted.

Found here. Pictures found in Giuseppe Acito’s flickr. Links to videos 1 & 2.