I dare you to see "Chicago" and not leave the theater humming one of the signature tunes. Set in the Roaring 20s, it is a biting satire of the media circus that still happens around famous criminals. Full of energy and comic timing, "Chicago" is a wonderful musical for today.
[2009: I watched it again in July and was still blown away. I have several of the songs in my music collection. Still a lot of fun.]