I don't know if I'm more sick of this Gotye song or that Call Me Maybe song (though Gangnam Style is quickly catching up to both of them) but this is actually pretty freaking cool: a bunch of old computer parts — hardrives, scanners, etc — combine to sing the song, 'Somebody That I Used to Know' by Gotye.
The HP Scanjet 3C actually pulls off the vocals. And as for the rest of the parts? Youtube user bd594 says:
Amiga 600 Bass on left audio output and Guitar on right audio output
Each audio channel was feed into an oscilloscope
2 Harddrives as the drums and cymbal
Xylophone as the Xylophone (duh)
Both the Harddrive and Xylophone are controlled by one PIC16F84A mircocontroller