If you think an orchestra is kept busy with Beethoven’s Seventh Symphony, you should see what a ballet troupe has to go through. Particularly when the choreographer is Twyla Tharp. “[J]ust as Beethoven’s symphony is inexhaustibly energetic, so is the ballet. Neither Beethoven nor Ms. Tharp runs out of steam.” The New York Times 02/07/01 (one-time registration required for access)