Vitamin Water commercial with Kelly Clarkson on a fake talk show charming a cobra with a Stratocaster. The bandleader is a happy guy playing only a Minimoog.
http://justjared.buzznet.com/2007/05/17/kelly-clarkson-vitamin-water-commercial/
YES! I saw that! I got so excited. Also there is the white castle comercial with the guy playing blues riffs on the etherwave pro theremin!