So Long, Farewell
One of my favorites from the first time I saw the film! It's a really cute song, and you get a good feel for each of the children's personalities. (The lyrics for this one remain unchanged for the reprise, which is spine-chilling when you know the new situation. "I'm glad to go, I cannot tell a lie / I flit, I float, I fleetly flee, I fly" has a whole new meaning when singing to an audience with Nazis watching!)