My wife is a theatrically trained singer, and she's one of those uber-hardcore Broadway fanatics. Next to my Yoko Kanno autographed Japanese theatrical Cowboy Bebop: Knocking on Heaven's Door poster in the den are posters autographed by the original Broadway cast of Rent, and one from A Chorus Line. What a freakish combination we are.
The only musicals I've been able to get into are A New Brain, Hedwig & The Angry Inch, and Avenue Q.
Everyone should Hedwig performed live, it's a truly magical experience.