Empire has the Imperial March and Yoda's Theme, and of course the Star Wars Main Title, three of the best pieces of Star Wars music. I can't choose, though. I kind of look at the Star Wars soundtracks like The Lord Of The Rings soundtracks; multiple parts of one complete score. That is why I'm looking forward to the Revenge Of The Sith soundtrack with the 'Best Of' Star Wars music DVD. All the best tracks from all six scores in video form. Maybe you'd like that.