Need to distinquish between appropriated music and original scores. Fairly easy to tack Beethoven's 9th onto a film and claim it as one of the best ever.
As for dedicated compositions you'll be very hard pressed to match this. The whole album, but especially this piece here. The Ecstacy of Gold by the maestro himself, Ennio Morricone, taken of course from the film The Good the Bad and The Ugly.
About 2 and half hours of the movie has already transpired when this climactic scene is unveiled. The photography combined with the music is simply breathtaking, especially when it reaches its zenith about 3:30 with the graves spinning around against the running figure. The backdrop of the civil war, of the personal battles in a savage landscape between the main protagonists, and the desire to find buried treasure are here portrayed like some divine drug, some holy dervish force driving them on, spinning them in ecstacy.
[video=youtube;2PwpOmjAu1M]http://www.youtube.com/watch?v=2PwpOmjAu1M&feature=related[/video]
I had the pleasure of seeing Morricone live at the Albert Hall this year. He performed this with full orchestra and a choir of a hundred or so. Utterly sublime. I can think of no better composer for the big screen; other examples of his genius, and that is the correct word here - Once Upon A Time in America, The Mission, Untouchables and Cinema Paradiso.
This will be pretty hard to top, film lovers.