Technically, the "Marble Machine" is played by the marbles, and powered by its creator, Martin Molin, of the Swedish band Wintergatan, turning a crank. But there's no time to quibble over semantics when we have something this incredible to watch videos of. Molin's instrument took 14 months of building and 3,000 individual parts, and we're pretty sure it was all worth it.
And watch another video of Molin creating the machine here:
• Wooden Hand-Cranked Instrument Runs on 2,000 Marbles [Gizmodo]