Doktor Faust was left incomplete at the time of Busoni's death. Intended as his masterpiece, the opera's genesis was complex and long. Based on Goethe's tragic play, the story of Faust's pact with the devil is well known but the opera's structure represents Busoni's unique conception, cast in two Prologues, a beautiful orchestral Intermezzo and three scenes. Exploring ideas of rationality and metaphysical doubt as well as the concepts of artifice and pretence inherent in operatic performance, the result is one of the most creative and unsettling of Busoni's works.