The Beggar's Opera is a ballad opera in three acts written in 1728 by John Gay with music arranged by Johann Christoph Pepusch.
 It is one of the watershed plays in Augustan drama and is the only example of the once thriving genre of satirical ballad opera to remain popular today.
 Ballad operas were satiric musical plays that used some of the conventions of opera, but without recitative.
 The lyrics of the airs in the piece are set to popular broadsheet ballads, opera arias, church hymns and folk tunes of the time.
This is a list of the recordings of Gianni Schicchi, the third of a group of three one-act operas by Giacomo Puccini collectively known as "Il trittico"; the other operas are "Il tabarro" and "Suor Angelica".
 The three were premiered at the Metropolitan Opera on 14 December 1918, and for the next three years were always played together.
 After 1921, however, Puccini agreed that the operas could be performed separately. "
Gianni Schicchi" became the most popular and most frequently performed of the three, often paired with other works such as Maurice Ravel's "L'heure espagnole" and Richard Strauss's "Salome".
New York Stories is a trilogy of English-language one-act operas ("Broken Pieces", "Just for the Night", and "Cradle Song") by Daron Hagen, with a libretto by Hagen and Barbara Grecki first performed in its entirety by Kentucky Opera in Louisville, Kentucky, on 30 October 2010.
Mörder, Hoffnung der Frauen ("Murderer, Hope of Women") is an opera in one act by Paul Hindemith, written in 1919 on a German libretto by Oskar Kokoschka which he based on his play of 1907.
 The opera was the first in a triptych of expressionist one-act operas, the others being "Das Nusch-Nuschi", and "Sancta Susanna".
 They were the first operas written by Hindemith.
 The first two were premiered together in Stuttgart on 4 June 1921, all three were performed at the Frankfurt Opera in 1922.
Below is a complete list of the operas performed by Wexford Festival Opera since its inception in 1951.
 Only complete operas presented on stage with orchestra are listed; over the years, the Festival has also presented programmes of scenes from operas and one-act operas with piano accompanement.
Gianni Schicchi (] ) is a comic opera in one act by Giacomo Puccini to an Italian libretto by Giovacchino Forzano, composed in 1917–18.
 The libretto is based on an incident mentioned in Dante's "Divine Comedy".
 The work is the third and final part of Puccini's "Il trittico" (The Triptych)—three one-act operas with contrasting themes, originally written to be presented together.
 Although it continues to be performed with one or both of the other "trittico" operas, "Gianni Schicchi" is now more frequently staged either alone or with short operas by other composers.
 The aria "O mio babbino caro" is one of Puccini's best known, and one of the most popular arias in opera.
Below is a complete list of the operas performed by The Santa Fe Opera (Santa Fe, New Mexico) since its inception in 1957.
 Only complete operas presented on stage with orchestra are listed.
 However, over the years, the company has also highlighted programs of opera scenes and one-act operas which showcase programs presented by the Apprentice Singers and Apprentice Technicians.
The Legend is a one-act tragic opera composed by Joseph Carl Breil to an English libretto by Jacques Byrne.
 It premiered at the Metropolitan Opera in New York City on March 12, 1919 in a triple bill with two other one-act operas, John Hugo's "The Temple Dancer" and Charles Cadman's "Shanewis".
 Its melodramatic story is set in Muscovadia, a mythical country in the Balkans, and involves an impoverished nobleman turned bandit, his daughter Carmelita, and her lover Stephen, a captain in the hussars.
 The action unfolds over a single night at the end of which both lovers are dead—Stephen stabbed to death by Carmelita and Carmelita shot by Stephen's fellow hussars.
 The only one of Breil's six operas to be performed by a major opera company, "The Legend" received scathing press reviews and after its three performances at the Met disappeared from the repertory.
Federico Moreno Torroba (3 March 189112 September 1982) was a Spanish composer, conductor, and theatrical impresario.
 He is especially remembered for his important contributions to the classical guitar repertoire, becoming one of the leading twentieth-century composers for the instrument.
 He was also one of the foremost composers of zarzuelas, a form of Spanish light opera.
 His 1932 zarzuela, "Luisa Fernanda", has proved to be enduringly popular.
 In addition, he composed ballets, symphonic works, and piano pieces, as well as one-act operas and one full-length opera, "El poeta", which premiere in 1980, starring well-known tenor Plácido Domingo.
 Moreno Torroba also ran his own zarzuela company, which toured extensively, especially in Latin America.
Bluebeard's Castle (Hungarian: A kékszakállú herceg vára ; literally: "The Blue-Bearded Duke's Castle") is a one-act opera by Hungarian composer Béla Bartók.
 The libretto was written by Béla Balázs, a poet and friend of the composer, and is written in Hungarian, based on the French literary tale "La Barbe bleue" by Charles Perrault.
 The opera lasts only a little over an hour and there are only two singing characters onstage: Bluebeard ("Kékszakállú "), and his new wife Judith ("Judit " ); the two have just eloped and Judith is coming home to Bluebeard's castle for the first time.

Question: Are Bluebeard's Castle and The Beggar's Opera both one-act operas?
Answer: no