Which opera has more acts, Genoveva or Moses und Aron?
Moses und Aron Moses und Aron (English: "Moses and Aaron") is a three-act opera by Arnold Schoenberg with the third act unfinished. The German libretto is by the composer after the Book of Exodus. Hungarian composer Zoltán Kocsis completed the last act, with Schoenberg's heirs' permission, in 2010, but as of 2014 "Moses und Aron" was almost always performed as Schoenberg left it in 1932, with only two of the planned three acts completed.
L'arlesiana L'arlesiana is an opera in three acts by Francesco Cilea to an Italian libretto by Leopoldo Marenco. It was originally written in four acts, and was first performed on 27 November 1897 at the Teatro Lirico di Milano in Milan. It was revised as a three-act opera in 1898, and a prelude was added in 1937.