Help with mixing Disney Princess movie scores?

You could always do a really stupid one like a light-hearted piece of music with a sad scene.

I think it would be cool to combine the BaTB transformation music with the scene where Triton transforms Ariel into a human :)
Here's one I made inspired by your idea:

Try doing the Mulan scene where the Huns attack Shang's army with the background score from the scene where Ariel get's into the fight with Triton and he destroys her collection. I just tried it (I played the Mulan scene muted with TLM's score) and it sounded really good.

I'll tell you if I get any more ideas!

EDIT:

Try doing it with this vid for Mulan (link) muted, starting at 5:36

And use the score from TLM here (link) starting at 5:39

The music pretty much works up until 7:14 on the Mulan vid.

It might be sort of trippy to switch the music to the scene where Snow White's freaking out in the forrest and the scene where Kokoum is trying to kill John Smith. That could be interesting in both instances! ;)