Do both Simon Boccanegra and Le roi d'Ys have the same number of acts?
Le roi d'Ys Le roi d'Ys ("The King of Ys") is an opera in three acts and five tableaux by the French composer Édouard Lalo, to a libretto by Édouard Blau, based on the old Breton legend of the drowned city of Ys. That city was, according to the legend, the capital of the kingdom of Cornouaille.
La naissance de la lyre La naissance de la lyre ("The Birth of the Lyre") is an opera (styled a "conte lyrique") in one act by the French composer Albert Roussel. The libretto, by Théodore Reinach, is based on the satyr play "Ichneutae" by Sophocles. It was first performed at the Paris Opéra on 1 July 1925 with choreography by Bronislava Nijinska.