Machine generated contents note: 1.Introduction -- pt. I Phantoms of the Opera -- 2.Phantoms of the Opera -- 3.Mozart and L'impresario -- 4.The Commendatore and the Clavier (Quadrille) -- pt. II Holy Spirits -- 5."Mozart's" "Twelfth Mass": Case Closed? -- 6.Enshrining Mozart: Don Giovanni and the Viardot Circle -- pt. III Specters at the Feast -- 7.Mozart in Two Worlds: The Writings on Music of Blaze de Bury -- 8.Speaking with the Supernatural: E. T. A. Hoffmann, George Bernard Shaw, and Die Oper aller Opern -- 9.The Specter at the Feast: Elvira Madigan and Its Legacy -- 10.Conclusion: The Mozart Effect.