Curlew River – A Parable for Church Performance (Op. 71) is an English music drama with music by Benjamin Britten to a libretto by William Plomer.
 The first of Britten's three 'Parables for Church Performance', the work is based on the Japanese "noh" play "Sumidagawa" (Sumida River) of Juro Motomasa] (1395–1431), which Britten saw during a visit to Japan and the Far East in early 1956.
 Beyond the "noh" source dramatic material, Britten incorporated elements of "noh" treatment of theatrical time into this composition.
 "Curlew River" marked a departure in style for the remainder of the composer's creative life, paving the way for such works as "Owen Wingrave", "Death in Venice", and the Third String Quartet.
Mireille is an 1864 opera in five acts by Charles Gounod to a French libretto by Michel Carré after Frédéric Mistral's poem "Mireio".
 The vocal score is dedicated to George V of Hanover.
Mireille Delunsch (born 2 November 1962) is an opera soprano.
 She was born in Mulhouse, France, and studied musicology and voice at the Conservatoire de Strasbourg.
 Her debut was at the Opéra du Rhin in Mulhouse, in Mussorgsky's Boris Godunov.
David Myerscough-Jones FCSD (15 September 1934 – 21 April 2010) was an English film, television, and theatre production designer.
 He spent the majority of his career with BBC TV, as well as in the theatre and opera production companies.
 He worked with the British composer Benjamin Britten on "Peter Grimes" (1969 Snape Maltings, Aldeburgh), "Owen Wingrave" (1970 BBC TV World Premier, Snape Maltings), and "Die Winteriesse" (1970 Britten Piano, Peter Pears Tenor).
Carlton Gauld (before 1931 – after 1960) was an American operatic bass who had a prolific career during the 1930s through the 1960s.
 Raised in Bedford, Indiana, Gustos first rose to prominence at the Metropolitan Opera in New York City, making his debut with the company in the 1931–1932 season as the King of Egypt in Giuseppe Verdi's "Aida".
 He made his debut with the Teatro Colón in Buenos Aires in 1932, shortly followed by his European debut at the Opéra Comique as Nilakantha in Delibes's "Lakmé".
 He remained at the Opéra Comique for three years, portraying a variety of roles like, Basilio in "The Barber of Seville", the title role in Giacomo Puccini's "Gianni Schicchi", the Prior in Massenet's "Le Jongleur de Notre Dame", de Grieux in "Manon", Lothario in "Mignon", Ramon in Charles Gounod's "Mireille", the four villains in "The Tales of Hoffmann", Count Almaviva in "Le nozze di Figaro", and Scarpia in "Tosca" among others.
 He also sang in the world premiere of Emmanuel Bondeville's "L’École des maris" (1933) with the company.
Take That are an English pop music group formed in Manchester, England in 1990.
 The group currently consists of Gary Barlow, Howard Donald and Mark Owen.
 The original line-up also featured Jason Orange and Robbie Williams.
 Barlow acts as the group's lead singer and primary songwriter, with Owen and Williams initially providing backing vocals and Donald and Orange serving primarily as dancers.Now though both Owen and Donald act as backing vocals.
Flames of Paris (Russian: Пла́мя Пари́жа ) is a full-length ballet in four acts, choreographed by Vasily Vainonen to music by Boris Asafyev based on songs of the French Revolution.
 The libretto by Nicolai Volkov and Vladimir Dmitriev was adapted from a book by Felix Gras.
 It was premiered at the Kirov Theatre in Leningrad on 7 November 1932, with Natalia Dudinskaya as Mireille de Poitiers, Vakhtang Chabukiani as Jérôme, Olga Jordan as Jeanne, Nina Anisimova as Thérèse, and Konstantin Sergeyev as Mistral.
 The conductor was Yuri Fayer.
Sylvia Fisher (18 April 191025 August 1996) was an Australian operatic soprano whose stage career was made in England, who was especially distinguished in German opera, and who created the role of Miss Wingrave in Benjamin Britten's "Owen Wingrave" in 1971.
Owen Wingrave, Op.
 85, is an opera (originally written for a televised performance) in two acts with music by Benjamin Britten.
 The libretto is by Myfanwy Piper, after a short story by Henry James.
Jean-Vital Jammes (known by the stage name Ismaël) (28 April 1825 – 13 June 1893) was a French opera singer.
 During a stage career spanning 40 years, he created many leading baritone roles, including Zurga in Bizet's "Les pêcheurs de perles" and Ourrias in Gounod's "Mireille".
 Born in Le Passage d'Agen near the town of Agen, he was largely self-taught and made his stage debut in 1841 at the age of 16.
 After singing in a several provincial theatres, he was engaged by the Théâtre Lyrique in Paris and later by the Opéra-Comique.
 Following his retirement from the stage, Ismaël lived in Marseille where he died at the age of 68.

Question: Which opera has more acts, Owen Wingrave or Mireille?
Answer: Mireille