“Untitled Sound Objects” is a series of sound installations by Zimoun an Pe Lang. They use computer controlled small machines and robots, in combination with different materials which are used as sound sources. This video gives you a nice overview.
This video shows you some of the test objects and experiments they did.
This last one called “Woodworms I” by Zimoun, is nothing more than a piece of wood, a microphone, a soundsystem and woodworms.