Looking for this Harry Potter music (not in the OSTS)

Hello, I'm looking for this music I found on a parody trailer about Harry Potter, but I can't find it on the soundtracks, I don't know if it's a based music, or I didn't seek it very well, it's this one:
http://www.youtube.com/watch?v=XOTlCOLpx7M
Can anybody help me?

marianne_uno, June 22, 2009; 4:35 PM