the difference is the movies are edited to the john williams songs.
if I wanted to make an album and have it sync up to any movie, all I would have to do is drop the movie into protools and find the tempo of the editing and mark those beats. then add in the tempo points of the songs that are already on the soundtrack. then, just write something new that had the same tempo and bam, somehow there is a mysterious syncing that takes place! I\'m a genius!