Which opera has more acts, Riders to the Sea or Lucio Silla?
Lucio Silla Lucio Silla (pronounced , ] ), K. 135, is an Italian opera in three acts composed by Wolfgang Amadeus Mozart. The libretto was written by Giovanni de Gamerra.
La toison d'or (opera) La toison d'or ("The Golden Fleece") is a French-language opera in three acts by the composer Johann Christoph Vogel, first performed at the Académie Royale de Musique (the Paris Opera) on 5 September 1786. The libretto, by Philippe Desriaux, is based on the legend of Jason and the Golden Fleece.