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.
Giuseppina (or Giuseppa) Brambilla (9 May 1819 – April 1903) was an Italian opera singer who, like her sisters Marietta and Teresa Brambilla, sang leading roles in the major opera houses in Italy, Spain, France and England.
 Although often described in modern reference works as a contralto, she also sang many soprano roles including Marie in "La fille du régiment" and Abigaille in "Nabucco".
 She married the tenor Corrado Miraglia in 1857 and retired from the stage in 1862.
 Her niece, Teresina Brambilla, was also an opera singer.
Daughter of the Regiment (German: Die Tochter des Regiments) is a 1933 Austrian-German comedy film directed by Carl Lamac and starring Anny Ondra, Werner Fuetterer and Adele Sandrock.
 It is loosely based on the 1840 opera "La fille du regiment" by Gaetano Donizetti, with the setting updated from the Napoleonic to the First World War.
 A separate French-language version was also released, with Ondra reprising her role.
The Opéra-Comique is a Parisian opera company, which was founded around 1714 by some of the popular theatres of the Parisian fairs.
 In 1762 the company was merged with, and for a time took the name of its chief rival the Comédie-Italienne at the Hôtel de Bourgogne, and was also called the Théâtre-Italien up to about 1793, when it again became most commonly known as the Opéra-Comique.
 Today the company's official name is Théâtre national de l'Opéra-Comique, and its theatre, with a capacity of around 1,248 seats, sometimes referred to as the Salle Favart (the third on this site), is located in Place Boïeldieu, in the 2nd arrondissement of Paris, not far from the Palais Garnier, one of the theatres of the Paris Opéra.
 The musicians and others associated with the Opéra-Comique have made important contributions to operatic history and tradition in France, and to French opera.
 Its current mission is to reconnect with its history, and discover its unique repertoire, to ensure production and dissemination of operas for the wider public.
 Mainstays of the repertory at the Opéra-Comique during its history have included the following works which have each been performed more than 1,000 times by the company: "Cavalleria Rusticana", "Le chalet", "La dame blanche", "Le domino noir", "La fille du régiment", "Lakmé", "Manon", "Mignon", "Les noces de Jeannette", "Le pré aux clercs", "Tosca", "La bohème", "Werther" and "Carmen", the last having been performed more than 2,500 times.
Daughter of the Regiment (German: Die Regimentstochter) is a 1953 Austrian historical film comedy film directed by Georg C. Klaren and starring Aglaja Schmid, Robert Lindner and Hermann Erhardt.
 It is based on the storyline of the 1840 opera "La fille du regiment" by Gaetano Donizetti.
 The plot had previously been used for a 1929 silent film and a 1933 sound film, and another film version was made 1953 by Géza von Bolváry.
Pietro Spagnoli (born 22 January 1964) is an Italian operatic baritone, born in Rome.
 In the 2013/14 season, he will be singing Sulpice Pingot in Donizetti's "La Fille du régiment" at The Royal Opera, having made his debut there as Figaro in "Il barbiere di Siviglia" and having since sung Rambaldo Fernandez in "La rondine".
Tenore di grazia , also called leggero tenor ("graceful" and "light" tenor, respectively), is a lightweight, flexible tenor voice type.
 The tenor roles written in the early 19th-century Italian operas are invariably leggero tenor roles, especially those by Rossini such as Lindoro in "L'italiana in Algeri", Don Ramiro in "La Cenerentola", and Almaviva in "Il barbiere di Siviglia"; and those by Bellini such as Gualtiero in "Il pirata", Elvino in "La sonnambula" and Arturo in "I puritani".
 Many Donizetti roles, such as Nemorino in "L'elisir d'amore" and Ernesto in "Don Pasquale", Tonio in "La fille du régiment", are also "tenore di grazia" roles.
 One of the most famous leggero tenors of that period was Giovanni Battista Rubini, for whom Bellini wrote nearly all his operas.
Teresa Ruggeri (sometimes spelled Ruggieri) was an Italian operatic soprano who had an active career from the 1820s through the 1840s.
 In 1827 she portrayed the role of Zarele in the world premiere of Giovanni Pacini's "Gli arabi nelle Gallie" at La Scala in Milan.
 She performed in several more world premieres at that house, including Francisca in Gaetano Donizetti's "Maria Padilla" (1841), Anna in Giuseppe Verdi's "Nabucco" (1842), and Viclinda in Verdi's "I Lombardi alla prima crociata" (1843).
 Other roles she performed at La Scala included Baroness Aspasia in Gioachino Rossini's "La pietra del paragone" (1829), Giannetta in Donizetti's "L'elisir d'amore" (1835), Alisa in Donizetti's "Lucia di Lammermoor" (1839), The Marquise of Birkenfeld in "La fille du régiment" (1840), and Giovanna in Verdi's "Ernani" (1844) among others.
Marie-Julie Boulanger, née Marie-Julie Halligner (29 January 1786 – 23 July 1850), was a French mezzo-soprano.
 She performed her entire career under the stage name Mme Boulanger, appearing in the world premieres of "Le maître de chapelle", "L'ambassadrice", "Le domino noir", and "La fille du régiment".
Die Walküre (The Valkyrie), WWV 86B, is a music drama in three acts by Richard Wagner with a German libretto by the composer.
 It is the second of the four works that form Wagner's cycle "Der Ring des Nibelungen" ("The Ring of the Nibelung").

Question: Which has more acts, Die Walküre or La fille du régiment?
Answer: Die Walküre