"Rumble" from West Side Story (the film version sounds "darker" and jazzier) ""Dance at the Village Vortex" from Wonderful Town (OBC is funky and fun) "Mazurka" on the original Candide "Entr'acte" from OBC of Cabaret for "changing" stuff.... "Overture" to Mama and the "Overture" to Irma La Douce
If you want to use something non-Broadway, there is an amazing track on Ernest Gold's filmscore for "It's A Mad Mad Mad Mad World". I've used it on a couple of projects, and it is called "Away We Go" (which makes it SORT of B'way, since that was the original title of "Oklahoma!")
Has anyone mentioned the "Oklahoma!" ballet sequence? That's a lovely piece, I think, and covers a variety of genres and has tone changes throughout which would make for dramatic lighting changes as well.
For something slightly diffferent, I would recommend a dance from "First Impressions," if you're looking for something with a period piece flavor. It's not too long, it's sprightly, with a lot of fifes, and quite charming.
Also upbeat and tuneful with some changes in mood, not too long, is "Sauce Diable" from "Jennie."
And an interesting mood piece is "Greenwillow Walk," from "Greenwillow," which lasts only a minute or so.