Bohemian Rhapsody, played by computer hardware

Mostly. The majority of the tune was composed of various bits of hardware scanning, disk-spinning and generally buzzing and humming.

The author? conductor? bd594 writes:

This is dedicated to all fans of Queen and hey let's not forget about Mike Myers and Dana Carvey of Wayne's World.
No effects or sampling was used. What you see is what you hear (does that even make sense?)
Atari 800XL was used for the lead piano/organ sound
Texas Instruments TI-99/4a as lead guitar
8 Inch Floppy Disk as Bass
3.5 inch Harddrive as the gong
HP ScanJet 3C was used for all vocals. Please note I had to record the HP scanner 4 seperate times for each voice. I tried to buy 4 HP scanners but for some reason sellers on E-Bay expect you to pay $80-$100, I got mine for $30.

He's also built a 250,000 volt Tesla coil.