Which opera had more acts, Das Liebesverbot or Lucia di Lammermoor?
Lucia di Lammermoor Lucia di Lammermoor is a "dramma tragico" (tragic opera) in three acts by Gaetano Donizetti. Salvadore Cammarano wrote the Italian-language libretto loosely based upon Sir Walter Scott's historical novel "The Bride of Lammermoor".
Die Harmonie der Welt Die Harmonie der Welt ("The Harmony of the World") is an opera in five acts by Paul Hindemith. The German libretto was by the composer.