soundtracks dont REALLY count - anyone can put in songs. i'm talking about original music for a film. my votes:

psycho - bernard hermann
so amazing. all of it, not just the shower scenen music. the bits wheres she in the car are best.

once upon a time in the west - ennio morricone
harmonica song sums it all up, eerie.

bugsy malone (cant remeber who did this???)
catchyness at it best

titanic - james horner
only the celine dion version is GAY. i like it so shut up.

last of the mohicans - trevor jones (also the few bits he did for "in the name of the father")
it was on last night so....