The Ecstasy of Gold by Ennio Morricone, complete with the accompanying scene from "The Good, The Bad, And The Ugly.
Probably my favourite piece of music ever. Why? It's not because it reminds me of the scene in question, there's nothing particularly special about that scene. It's not because it reminds me of the movie, despite the fact that it's a bloody good film.
No, it's because, to me, that is THE most BEAUTIFUL piece of music ever to have been composed by mortal man to this day. I make especially sure not to listen to it too often, because absence makes the heart grow fonder. And even though I'm an emotionally detached person, this song, everytime I hear it, has me producing at least a single tear from my otherwise dried-up and inoperative tear glands.
Also, a lot of orchestral video game theme tunes appeal to me, just because I just imagine any final battle occurring with them playing, as well as in a lot of cases just capturing the general atmosphere of the game they represent. Legend of Zelda's legendary theme (although the soundtrack for pretty much any LoZ is generally beautiful), the Starfox theme, the Metal Gear Solid theme, etc.