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I just found out that "The Simpsons" producer-director, Sousaphonist David Silverman did the Simpsons Coke commercial that will air during the Superbowl this year. He also plays the tuba on the soundtrack of the commercial - but it is apparently not a major part...

As it turned out - the tuba part was really quite significant!
http://www.youtube.com/watch?v=9NSMVRfT4ZQ

I guess it helps if you are the director of the ad and want to play the tuba part