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Here is a couple more good ones.
http://www.youtube.com/watch?v=lIOZ7tQ98-U
http://www.youtube.com/watch?v=iyM9u6xZ_2E

This is an explanation I got years ago when someone else did this.
Here's how the magic was achieved (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. The technicians simply programmed their engine to run through the various rev/note ranges in the correct sequence. The result is delightful.
 
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