Floppy drive organ plays toccata

YouTube user FunToTheHead has created a working organ that uses finely tuned wheezing floppy drives to play rather impressive renditions of music. It's not easy to sequence for four-note floppy-drive organs, but FunToTheHead has done a rather good job with Toccata and Fugue -- a solid choice for any mad-science organ! I love that he's got the blinkenlights synched with the music.

People have made floppy drives sing before, but this is my personal take on it.

Features two 3 1/2" drives and two 5 1/4" drives connected to a PIC18f14k50 microcontroller. It interfaces to any MIDI source via MIDI over USB. Straight MIDI would also be possible with an additional small circuit and some minor firmware changes. This initial version can respond to all 128 MIDI notes, and pitch bends +/- 2 semitones.

As it can produce only four simultaneous notes, and each drive has a different range and tonal characteristics, best results are obtained by arranging compositions by hand. However, it features two modes of operation: in one mode, MIDI channels 1 through 4 are played directly on floppy drives 1 through 4. In the other mode, all 16 MIDI channels are read, and notes are "intelligently" divvied out on a first-come, first-serve basis. "Note stealing" ensures that melody lines sound, but chords are often cut short. One or the other produces acceptable results for many unmodified MIDI files straight out of your favorite media player.

Phantom of the Floppera

So I built a musical instrument out of antiquated PC hardware... (Reddit)

(Thanks, Evan!)