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.
Orion (Lacoste) Orion is an opera by the French composer Louis Lacoste, first performed at the Académie Royale de Musique (the Paris Opera) on 17 February 1728. It takes the form of a "tragédie en musique" in a prologue and five acts. The libretto was begun by Joseph de Lafont, and completed after his death by Simon-Joseph Pellegrin. The plot is based on the Greek myth of Orion.