Playwright Peter Shaffer, best known for dramatizing the life of Mozart in Amadeus, is taking another crack at the classical music world, with another famously tragic composer as his subject. The as yet untitled play, which Shaffer has spent a decade writing, focuses on the life and (mostly) death of Russian composer Pyotr Tchaikovsky, and the New York producer that first brought Amadeus to the stage is already licking its chops at the prospect of a sequel.