Rainbow. For me it was the transition from the end of the story where everything has been resolved to the credits and represents the type of thoughtful reflection that I have after seeing a movie. There isn't much said after the song starts (IIRC) but it was one of those things that makes you want to keep sitting in the theater until the curtain rolls in.
Plus I'm a sucker for sustained piano chords, and the intro doesn't disappoint here.