You Gotta Be a Football Hero (to Get Along with the Beautiful Girls)
I doubt it’ll give an “American” vibe, but if the kids wear NY Giants uniforms on stage, “The Rite Of Spring” would be fitting. 
Maybe Prokofiev’s “Montagues and Capulets” if there’s Dallas Cowboys and Philadelphia Eagles jerseys??
“Get Ready for This” by 2 Unlimited is played very frequently in American stadiums to pump up the crowds.
The touching coda about the players’ lives after the game set to some classic Pink Floyd?
Wouldn’t this be more apropos?
Or some Six Down Blues? Of course, that might need to be updated next week.
Also this.
While Leonard Bernstein and Stephen Sondheim did write the Jet song for West Side Story, Bernstein also wrote Pass the Football with Condem and Green from Wonderful Town
What about that song “Football” from that 80’s movie Wildcats? It’s an old-school rap
Not a big hit, but the song was used in NFL commericals: All Kinds of Time.
Not sure how big country music is in Germany, but Kenny Chesney’s the Boys of Fall is all about football.
Thanks to all for the great recommendations. I forwarded a list of songs from this thread to the dance teacher via my friend. I’m curiously looking forward to what she’ll choose.