If you're making a big film in which lots of people fight, and there are sad moments, for God's sake get Hans Zimmer to score it.
Gladiator has been mentioned lots of times in this thread but nobody's posted it yet. It is the best soundtrack in the world: when the track below gets going it actually pushes everything else out of my head and I literally cannot think of anything at all for a couple of minutes. Most of the rest of these are magnificent too: