I can't find any documentation for this, nor can I help posting it.
I assume it's a hardware hack that manually controls the floppy drive's stepper motor, but it'd make my day if this was done in software using standard I/O requests. Either way, the 3.5 inch FDD finally serves an important function again.
Star Wars Floppy Disk
http://www.hackszine.com/blog/archive/2008/06/star_wars_music_played_by_a_fl.html