All you hear is rumbling bass guitars and saxaphone, but I recognized the song immediately. The song currently being used by Chevrolet in their Truck Month commercials is an old Morphine song. Details and commercial below

Song: Thursday (iTunes) | (Amazon)
Artist: Morphine
Album:  Cure for Pain (iTunes) | (Amazon)

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1. Life – 10/31/2007 Episode
2. Tunes On TV update