Here's the Magic Kingdom at night. Most of this video is filmed on Main Street USA, one clip is from Liberty Square, inside The Emporium store and Wishes fireworks from the Ticket and Transportation Center.
This was filmed on Friday December 23rd, 2011.
I created a store on Amazon.com with a lot of great theme park books and other great resources on theme parks. You can also find some of the music used in the parks there.