Can someone please suggest a musical?

The tradition at my High School is that every year, our last play is a musical. We have a new choir director this year, though, and she's not sure if she wants to do one - but everyone else wants to! I think we could persuade her if we can suggest a musical with a very small ensemble cast - can anyone please suggest one? It can have a large acting cast, but the ensemble needs to be small, and the play needs to be appropriate for High Schoolers. (In the past, we've done Grease, The Wizard of Oz, Bye-Bye Birdie, etc.) Thanks so much!