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.
Erwin und Elmire Erwin und Elmire is an opera in two acts by Duchess Anna Amalia of Brunswick-Wolfenbüttel, with a libretto by Johann Wolfgang von Goethe, after Oliver Goldsmith's ballad of Angelica and Edwin, "The Hermit", in his sentimental novel "The Vicar of Wakefield".