http://uk.youtube.com/watch?v=VqnTKTwcft... Assuming you mean the music behind the banging and crashing at the start, it's Modest Mussorgsky, 'A Night on the Bare Mountain'. Or Bald Mountain. Nikolay Rimsky-Korsakov also had a hand in what what you hear. Full details on Wikipedia.
The piece is best known popularly from Disney's 'Fantasia'. http://www.youtube.com/watch?v=V8Ca_edg6... Musorsky, Night on a bare Mountain,Merry Christmas. Listen / download it here
Also used in Disneys Fantasia and adapted for Saturday Night Fever as Night On Disco Mountain
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