Which opera  Pelléas et Mélisande and Die schweigsame Frau has fewer acts ?
Die schweigsame Frau Die schweigsame Frau ("The Silent Woman"), Op. 80, is a 1935 opera in three acts by Richard Strauss with libretto by Stefan Zweig after Ben Jonson's "Epicoene, or the Silent Woman".
Die Hochzeit Die Hochzeit ("The Wedding", WWV 31) is an unfinished opera by Richard Wagner which predates his completed works in the genre. Wagner completed the libretto, then started composing the music in the second half of 1832 when he was just nineteen. He abandoned the project after his sister Rosalie, who was the main supporter and the spokesman of the family, expressed her disgust at the story. Wagner destroyed the libretto.