Ok this wasnt my discovery!!

but in the coffee house section of AF

Someone started a thread about an F1 engine programed to hit certain revs in a sequence that makes a song...yada yada go check it out
Or http://www.automotiveforums.com/vbulletin/showthread.php?s=&postid=695645&t=5150#post695645 that may get you there.
Can you tell I'm bored??