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.
Le diable à quatre (ballet) Le Diable à quatre is a ballet in two acts and three scenes (or in three acts), with choreography by Joseph Mazilier, music by Adolphe Adam, and libretto by Adolphe de Leuven, first presented by the Ballet of the Académie Royale de Musique on 11 August 1845, with Carlotta Grisi (as Mazourka) and Lucien Petipa (as Count Polinski).