Here's something you don't hear every day;

You'll hear a 10-cylinder, 750 horsepower Asiatech Formula-1 engine being warmed up. Then it performs a rousing version of "When The Saints Come Marching In", to the delight of assembled pit staff and journalists.

Click on the link to listen.  Or, if you have a slow connection, right-click and save on your computer - it'll sound smoother if you play it after downloading.  It's just 275 kbytes.  (Sorry, the sound file is apparently corrupted at the end, but you'll still get the effect)
Asiatech.mp3
How did they do that? (technical/musical details via F1 Racing magazine):

As we all know, a V10 engine produces five combustions per revolution at a frequency per second of 60/(5 x revs per minute), which equals 12/rpm. Therefore, to work out the revs you need to hit a particular musical note, you multiply the note's frequency by 12. To play a 440Hz 'A', for example, you need 5,280rpm. For 'C', use 3,139rpm, for 'F' 4,191rpm, and so on.

Asiatech's French technicians (the engine, despite its name, is derived from a Peugeot design) simply programmed their engine to run through the various rev/note ranges in the correct sequence. The result is delightful. And think of the possibilities - BMW's F1 engine, which howls all the way to 19,050rpm, could rip through the entire Hendrix songbook.