This video captures a performance of Calum Scott's GuitarGlitch project, which features guitar music robots that play glitch music.
Scott explains the technology behind his guitar robots:
The solenoids are all 12v (from rs-online.com) and are connected to an Arduino Duemilanove board (arduino.cc) and the power supplies with a TIP120 transistor circuit similar to this. The leds are on the same pins as the solenoids.
The code running on the Arduino is SimpleMessageSystem which is then controlled from Max/Msp. There are also 2 6v dc motors on the headsocks which are from a mechano set and are controlled by a Miditron board (eroktronix.com).
GuitarGlitch is part of Scott's masters portfolio for Glasgow University music department.