But his operatic catalogue also contains some highly unusual works, like Messaien's St Francis of Assisi, John Adam's Death of Klinghoffer, the above mentioned Rodrigue et Chimene by Debussy, Busoni's Turandot and Doktor Faust, Carlisle Floyd's Susannah, the original four-act version of Britten's Billy Budd, Weill's Seven Deadly Sins and the never performed original version of Mahler's Das Klagende Lied.