Which has more acts, Die Walküre or La fille du régiment?
La fille du régiment La fille du régiment ("The Daughter of the Regiment") is an opéra comique in two acts by Gaetano Donizetti, set to a French libretto by Jules-Henri Vernoy de Saint-Georges and Jean-François Bayard. It was first performed on 11 February 1840 by the Paris Opéra-Comique at the Salle de la Bourse.
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.