"Where In the World Is Carmen Sandiego?" by Rockapella
A favorite a capella (no instruments, only vocals) track.
I think this is one of the first examples that I can think of. It's stuck with me because it was on the show. I actually am pretty bad about geography, but it was something that was on.
But, going back to the song. It's fun and super catchy. It might get you to learn something.