Carnival music, like merry go round calliope and fairground organs
Music from obscure cartoons, games, and theme parks
Disco
German polka
Irish folk music, both real and fantasy
Country music from fantasy worlds
Daft Punk remixes, especially if they involve Tesla coils
And here's a new genre I didn't even know about until I went to powwow last year... drum circle covers of popular kids songs XD I shit you not, I found a CD with the SpongeBob SquarePants theme song played by Native Americans, in a Native American style.
In case you don't believe me: