Kurt Weill is one of the most celebrated of twentieth-century composers, but one whose more serious work is still little known. We know Weill for The Threepenny Opera, Mahagony, and The Seven Deadly Sins; for 'Mack the Knife' and 'September Song'; for his marriage to Lotte Lenya and his collaboration with Bertolt Brecht. This groundbreaking book, written by the foremost authority on Weill, provides the first definitive survey of his life and work.