Wasn't that Mazursky?
Nope, it's already been mentioned ... Edvard Grieg's Peer Gynt Suite. One section is called "In The Hall of the Mountain King."
Ruh, Roh! The only part of the Peer Gynt Suite with which I'm familiar is the 'pastoral' sounding one that tended to be used a lot in cartoons! The only recording I have of it is on a compilation disc of "Relaxing Classical Music". I'll have to fire up the CD player and give my kids some culture while they're doing their (home)schoolwork!