There's a standard, almost a running joke now, that a device isn't a device if it can't play Doom. I didn't know this also applied to musical instruments.
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This piano plays Doom. Well, it acts as a controller, but still. It's amazing. Different keys control different aspects of the game (white for motion, black for actions), and the resulting noise is the perfect complement to the hellish visuals.
Doom Piano is a piano that plays Doom, naturally [Gamasutra]