A lot of the movie songs I like have already been mentioned, but here goes...
Bohemian Rhapsody, by Queen in Wayne's World.
Singin' in the Rain and Make 'em Laugh.
The Pied Piper Overture.
Others that I don't remember right now.
How do you solve a Problem like Maria?
I'm a sucker for a good musical. I liked Chicago, but I don't think it had any really memorable songs. I liked it when the Hungarian murderess sang, though.
EDIT: One of the hideous and bad Jason Voorhees movies had a soundtrack by Alice Cooper that I liked.