Well, for music, Stairway to Heaven would work. But here are a few suggestions for some music aswell. Some calm ideas:
Wonderwall - Oasis
Bittersweet Symphony - The Verve
Speed of Sound - Coldplay
And here's a more upbeat idea:
Put your hands up for Detroit - Fedde le Grand
What would be pretty cool for the Flash once it's done, is some guy running/climbing through all the pictures, possibly interacting with them abit aswell. This would take a long time to make though. Just make sure it's slow enough so you can really see every submission.