Here are some quick and easy steps you can follow to try and get in a Disney parade.
1. Assemble 50-150 of your most musically inclined friends.
2. Pick instruments, and form a marching band.
3. Learn a few songs. Get really good at playing them.
4. Find a football field, and work on marching/choreography. (My personal favorite is a 220 BPM high-step entry, but your mileage may vary)
5. Video tape a performance
6. Send the video to Disney's Magic Music Days
7. If they like your video, they may invite you to march at Disney World.
See? Wasn't that easy?