Which opera has more acts, Einstein on the Beach or Owen Wingrave?
Owen Wingrave Owen Wingrave, Op. 85, is an opera (originally written for a televised performance) in two acts with music by Benjamin Britten. The libretto is by Myfanwy Piper, after a short story by Henry James.
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.