Commodore 64 played midi files? Not as far as I can remember - it had an awe-inspiring sound chip capable of playing an incredible 3 notes simultaneously. One of the tone generators doubled as the pseudo-random number generator, so if the sound chip went FUBAR then games got somewhat predictable.

Hmm, they're releasing the C64 in a joystick this year. Might have to take a trip down Nostalgia Lane and pick one up to play Paradroid again.