Mine would have to be "The Tea Party" from "Dear World.
It may have flopped terribly on Broadway, but it had a spectacular score.
You can give it a listen here: http://www.youtube.com/watch?v=KxLKG303D5
It's a bit long, but it's worth it.
(If you don't know what counterpoint is, it is a musical style in which multiple different melodies, which can stand on their own, can be played together and blend. Examples are fugues, canons, and rounds. Counterpoint compositions are sometimes called contrapuntal compositions.
You can get a better definition here if you want: