There definitely is a difference between the PEPSI CM clip and the audio preview posted @ her site before its digital/airplay release!; I think the sound quality is a little more finely tuned and on key for commercials than it would be say ever playing from a radio or average MP3 rip online. It was similar with 'Simple & Clean" in the TV promos for Kingdom Hearts versus the versions on the "COLOR" single and the 'TITO' album were, I know the Opening and Closing arrangements would obviously quite a bit more contrasting, but the CM and single's audio were definitely also distinctive (I love the Planit-B version mix best of any, its a lot more uplifting and emotionally visceral)...