Which opera  Pelléas et Mélisande and Die schweigsame Frau has fewer acts ?
Pelléas et Mélisande (opera): Pelléas et Mélisande ("Pelléas and Mélisande") is an opera in five acts with music by Claude Debussy. 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 schweigsame Frau