Yeah, WALL-E is a really interesting movie. When I first saw it I was rather young and don't think I realized that it was missing dialogue at the time. It wasn't until I went back that I noticed, showing just how perfect the music for the film was since it filled in all of the voids without the audience even questioning it. Then of course there is Cast Away, which is almost devoid of music and is also a powerful use of silence.
RE: Harry Potter and the Goblet of Fire - Hogwarts' March - Piano Cover (Synthesia)