Here's a couple you might consider: Vive la Compagnie,(or Vive l'amor, I never could spell in French,) and Sam Hall. Sam Hall's a real sing-along foot stomper. I used it as a lullaby when the kids were small. My ex-wife hated it. (There's probably a lesson in there somewhere) Both are excellent a capella.

Somebody mentioned The Patriot Game, and it's a fine tune, but doesn't have a chorus and when there's no chorus people in the crowd tend to take it as a call for creativity. Winds up sounding like...well, use your imagination.

O'Meara