I recommended Malick's "Days of Heaven" as one of the first posts on Robosexual, when I was attempting to cover music, film, games, books, and everything else under the sun. It's an amazing movie, and it is accompanied by a beautiful soundtrack, done by none other than the man himself, Ennio Morricone. The sound is very evocative of the movie, especially for the scenes which are marked by a lack of dialogue and only scored. Morricone's trademark palette of strings, horns, and guitar is in full effect here, but it's much more subdued than, say, the theme to "The Good, The Bad, and The Ugly."
There isn't much of it, though, only 26 minutes, but it was a short movie and much of it was quiet anyway, with only the sound of wind blowing through grass or a weather vane creaking as it turns. I'm giving you my favorite tracks, one a recurring theme of the movie accompanying the harvest, and the other which occurs only one one occasion in the film and was instantly memorable to me. If you haven't seen the movie, go get it, but also check out the soundtrack here.