Just a topic to get people talking, one of the things which helps create and maintain a gripping atmosphere in a film is the soundtrack, I'm interested in hearing what film soundtracks you really enjoyed and why.
I'll start with a very new one, The soundtrack to Aronofsky's Black Swan:
This is fantastic a mixture of music from Swan Lake and original score creates a ery interesting atmosphere with how the music often works with what the character Nina is seeing whereas sometimes it is also a complete opposite to what is actually happening.