Favourite Score?

I wanted to see which of the scores what people's feelings were on the different scores of the film and why they enjoyed them. Is there a particular piece that LEAPS out at you (excuse the dodgy pun)? Is there a particular moment that sticks in your mind because of the score? Do you feel that there were particular scores which were more lacking than others? I really just want to hear people's opinions on the scores of the original films... I can't wait to hear the score for Prometheus on the big screen!