Almost anything played with the aquasonic waterphone...

Yeah i guess i got a little excited. Just that is one of my fav scenes out of just about any movie ive seen for a long time. To me thats what a horror is all about being place in a postion ya would hate to be in.

Jaws.
Psycho.
Zombie Flesh Eaters.
Night of the Living Dead (1968).
Halloween.
The Exorcist.

Omen,evil dead,nightmare on elm st.

GOBLIN (Suspiria, Deep Red Profondo Rosso, Tenebrae, Opera, etc etc)
Halloween (Halloween Part III Season of the Witch theme called Chariots of Pumpkins I thought was even better then the original)
28 Days Later (or Weeks)
Candyman
the Omen
the Exorcist
Friday the 13th

I myself enjoy the original Dawn of the Dead, and of course one of every ones favorites Halloween.:D

the exorcist is definitely the most chilling. i like the silence of the lambs soundtrack - powerful.

as for fun with horror film soundtracks - i love the gorillaz opening for M1A1 with the tune from Day of the Dead

i must say,robert rodriguez did a great job with the music from dusk til dawn,i imagine he had help from quentin.
tarantino is the master of the soundtrack.

american werewolf in paris/london was good.....return of the living dead had GREAT music!

Good sound tracks but not scary in the least.