We haven't had our evening there yet (so no pics), but I asked specifically about the music for Wishes, and they said that is included in the cost! As for DP, they have a separate menu through the Grand Floridian. We've ordered a 1/4 sheet cake (with custom design) instead of doing what they call "miniature desserts," like you'd have at a DP in EPCOT. They also have other food available, not just desserts.
I'm sure other ladies could give you even more info!
HTH!