This isn't an actual TV show or commercial, but it was too awesome NOT to post. In this video, the men's glee club at University of Michigan performs a medley of Nickelodeon songs. I wish we would have done something that cool back in my choir days.
Theme songs performed include:
Salute Your Shorts
Doug (and "Killer Tofu"!)
Angry Beavers (which was after my time)