Wow, so many to choose from, but the first that comes to mind is the music from
The Good, The Bad and The Ugly
The main theme is pretty good, even made it into the charts, but for me it's the music during the 3-way mexican standoff toward the end of the movie.... "
The Ecstasy of Gold" composed by Ennio Morricone, genius.
The theme from
Hitch Hikers Guide to the Galaxy is up there too. "
Journey of the Sorcerer" by the Eagles.
The soundtrack for
The Fifth Element is wierd but cool.