Question: The Cooper is a comic opera, in two acts, by which English composer?

Context articles: The Mountebanks
Ruddigore
The Rival Poets
L'elisir d'amore
Thomas Arne
Keto and Kote
The Cooper
Sardakai
Zaide
The Pirates of Penzance

The Mountebanks is a comic opera in two acts with music by Alfred Cellier and Ivan Caryll and a libretto by W. S. Gilbert.
 The story concerns a magic potion that causes the person to whom it is administered to become what he or she has pretended to be.
 It is similar to several "magic lozenge" plots that Gilbert had proposed to composer Arthur Sullivan, but that Sullivan had rejected, earlier in their careers.
 To set his libretto to music, Gilbert turned to Cellier, who had previously been a musical director for Gilbert and Sullivan and had since become a successful composer.
 During the composition of the piece, however, Cellier died, and the score was finished by the original production's musical director, Ivan Caryll, who became a successful composer of Edwardian Musical Comedy.
Ruddigore; or, The Witch's Curse, originally called Ruddygore, is a comic opera in two acts, with music by Arthur Sullivan and libretto by W. S. Gilbert.
 It is one of the Savoy Operas and the tenth of fourteen comic operas written together by Gilbert and Sullivan.
 It was first performed by the D'Oyly Carte Opera Company at the Savoy Theatre in London on 22 January 1887.
The Rival Poets, or the Love Charm is an English comic opera in two acts by Edward German to a libretto by W. H. Scott.
 The opera was first performed under the title "The Two Poets" at the Royal Academy of Music in London in July 1886.
L'elisir d'amore (The Elixir of Love, ] ) is a comic opera ("melodramma giocoso ") in two acts by the Italian composer Gaetano Donizetti.
 Felice Romani wrote the Italian libretto, after Eugène Scribe's libretto for Daniel Auber's "Le philtre" (1831).
 The opera premiered on 12 May 1832 at the Teatro della Canobbiana in Milan.
Thomas Augustine Arne ( ; 12 March 1710, London – 5 March 1778, London) was an English composer, best known for the patriotic song "Rule Britannia".
 He also wrote a version of "God Save the King", which became the British national anthem, and the song "A-Hunting We Will Go".
 Arne was the leading British theatre composer of the 18th century, working at Drury Lane and Covent Garden.
Keto and Kote (Georgian: ქეთო და კოტე, "Keto da kote") is a comic opera in three acts, by the Georgian composer Victor Dolidze who also wrote the libretto based on Avksenty Tsagareli's 19th century romantic comedy "Khanuma".
 Considered the first Georgian comic opera, "Keto and Kote" premiered in Tbilisi on December 11, 1919.
 An immediate success at its premiere, Dolidze's opera remains a popular classic in Georgia and was made into a film in 1947 with additional music composed by Archil Kereselidze on traditional Georgian folk tunes.
The Cooper is a comic opera in two acts by composer Thomas Arne.
 The English libretto by Arne is based on Nicolas-Médard Audinot and Antoine François Quétant’s "Le tonnelier".
 The opera premiered in London at the Theatre Royal in the Haymarket on 10 June 1772.
Sardakai, Op.
 206, is a 1969 comic opera in two acts by Ernst Krenek which premiered in Hamburg in 1970.
 The "lightweight, fluffy farce", as Krenek described it, dealt with a "Così fan tutte" inspired scenario on the fictional South Seas island of Migo Migo.
 Krenek's libretto was intended to poke fun at both left and right wing "sacred cows".
 The premiere was a catastrophe, attributed by some contemporary and subsequent commentators to the Hamburg Opera director's decision to commission Krenek, who was living in California, to write his own libretto which proved to be out of touch with both the prevailing mood in Germany, and the situation at the Hamburg Opera.
Zaide (originally, "Das Serail") is an unfinished German-language opera, K. 344, written by Wolfgang Amadeus Mozart in 1780.
 Emperor Joseph II, in 1778, was in the process of setting up an opera company for the purpose of performing German opera.
 One condition required of the composer to join this company was that he should write a comic opera.
 At Salzburg in 1779 Mozart began work on a new opera (now known as "Zaide" although Mozart did not give it such a title).
 It contains spoken dialogue, which also classifies it as a "Singspiel" (literally, "singing play").
 Only the arias and ensembles from the first two acts were composed.
 Missing are an overture and third act.
The Pirates of Penzance; or, The Slave of Duty is a comic opera in two acts, with music by Arthur Sullivan and libretto by W. S. Gilbert.
 The opera's official premiere was at the Fifth Avenue Theatre in New York City on 31 December 1879, where the show was well received by both audiences and critics.
 Its London debut was on 3 April 1880, at the Opera Comique, where it ran for 363 performances, having already been playing successfully for more than three months in New York.