Question: Are both pieces The Immortal Hour and L'incoronazione di Poppea an opera?

full_context: Document 1: Alec Roth: Alec Roth (born 1948) is an English composer. He is best known for his collaboration with Vikram Seth to produce the opera "Arion and the Dolphin" in 1994 based on the myth of Arion.
Document 2: The Turn of the Screw (opera): The Turn of the Screw is a 20th-century English chamber opera composed by Benjamin Britten with a libretto by Myfanwy Piper, "wife of the artist John Piper, who had been a friend of the composer since 1935 and had provided designs for several of the operas". The libretto is based on the novella "The Turn of the Screw" by Henry James. The opera was commissioned by the Venice Biennale and given its world premiere on 14 September 1954, at the Teatro La Fenice, Venice. The original recording was made during that year, with the composer conducting.
Document 3: L'incoronazione di Dario (Perti): L'incoronazione di Dario ("The Coronation of Darius") is an opera in three acts composed by Giacomo Antonio Perti to a libretto by Adriano Morselli (revised by Giorgio Maria Raparini). It premiered on January 13, 1686 at the Teatro Malvezzi in Bologna. Morselli originally wrote the libretto for Domenico Freschi's opera "Dario" which premiered at the Teatro San Angelo in Venice in 1685. Other later uses of the libretto include Giuseppe Aldrovandini's 1705 "L'incoronazione di Dario" (with the libretto revised by Andrea del Pò) and Vivaldi's 1717 "L'incoronazione di Dario" (with the libretto revised by an unknown author).
Document 4: L'Orfeo: L'Orfeo (SV 318) (] ), sometimes called La favola d'Orfeo ] , is a late Renaissance/early Baroque "favola in musica", or opera, by Claudio Monteverdi, with a libretto by Alessandro Striggio. It is based on the Greek legend of Orpheus, and tells the story of his descent to Hades and his fruitless attempt to bring his dead bride Eurydice back to the living world. It was written in 1607 for a court performance during the annual Carnival at Mantua. While Jacopo Peri's "Dafne" is generally recognised as the first work in the opera genre, and the earliest surviving opera is Peri's "Euridice", "L'Orfeo" is the earliest that is still regularly performed.
Document 5: Ottone in villa: Ottone in villa ("Otho at his villa", RV 729) is an opera in three acts by Antonio Vivaldi to an Italian libretto by Domenico Lalli (the pseudonym of Sebastiano Biancardi). It was Vivaldi's first opera and premiered on 17 May 1713 at the Teatro delle Grazie in Vicenza. Lalli's pastoral drama is set in ancient Rome and was a condensed adaptation of Francesco Maria Piccioli's satirical libretto for Carlo Pallavicino's opera "Messalina" (1679). However, Lalli changed several of the characters in Piccioli's libretto. Messalina became an invented character, Cleonilla. Emperor Claudius became another Roman emperor, Otho (Ottone), who had already appeared as a protagonist in Monteverdi's "L'incoronazione di Poppea" (1642) and in Handel's "Agrippina" (1709).
Document 6: L'incoronazione di Poppea: L'incoronazione di Poppea (SV 308, "The Coronation of Poppaea") is an Italian opera by Claudio Monteverdi, with a libretto by Giovanni Francesco Busenello, first performed at the Teatro Santi Giovanni e Paolo in Venice during the 1643 carnival season. One of the first operas to use historical events and people, it describes how Poppaea, mistress of the Roman emperor Nero, is able to achieve her ambition and be crowned empress. The opera was revived in Naples in 1651, but was then neglected until the rediscovery of the score in 1888, after which it became the subject of scholarly attention in the late 19th and early 20th centuries. Since the 1960s, the opera has been performed and recorded many times.
Document 7: Anna Karenina (Hamilton): Anna Karenina is an opera in three acts by Scottish composer Iain Hamilton. The libretto, based on Leo Tolstoy's novel, "Anna Karenina" was written by the composer. "Anna Karenina" was premiered on May 7, 1981 at the London Coliseum by the English National Opera in a performance conducted by Howard Williams with Lois McDonall in the title role. The director was Colin Graham and the designers were Ralph Koltai and Annena Stubbs. Its running time is approximately two and a quarter hours.
Document 8: Villa Poppaea: The Villa Poppaea is an ancient Roman seaside villa ("villa maritima") situated between Naples and Sorrento, in southern Italy. It is also called the Villa Oplontis or Oplontis Villa A by modern archaeologists. The villa itself is a large structure situated in the ancient Roman town of Oplontis (the modern Torre Annunziata), about ten metres below modern ground level. Evidence suggests that it was owned by the Emperor Nero, and it is believed to have been used by his second wife, Poppaea Sabina, as her main residence when she was not in Rome.
Document 9: Agustus Montrose: Agustus Horatio Montrose (1830–1899) was an English novelist and playwright operating in the northeast of London in the mid to late 19th century. He is especially notable for one novel (see Lilies In December) and several plays, although he wrote 22 known pieces and there is a possibility that more were created unknown to the scholars who study him. He is considered influential to many later 19th and 20th century authors, including Joseph Conrad. Spending a life in semi-poverty with only moderate success, Montrose was popular among many citizens. Two of his plays have been banned by various Private Libraries. When asked about the abnormal parody of the name Augustus, Montrose said, "My mother liked the name Augustus, but was absolutely an individual and she didn't want a name for me that would be common. Thus she decided upon Agustus, to be pronounced identically to Augustus but spelled without the 'u'."
Document 10: Imminent, Indeed: Imminent, Indeed (or "Polly Peachum's Peculiar Penchant for Plosives") is a gothic adaptation of John Gay’s "The Beggar’s Opera". Written and directed by Bryn Manion with the assistance of Wendy Remington, and leading man, Sam. Produced by the Creatives and the founding board members of the company of Aisling Arts. This adaptation focuses on Polly Peachum's side of the story and her world as it trips alongside that of Jenny Diver, a new Peachum brother, several comically nefarious underlings, and of course, the ever villainous Henry Macheath (known as "Mack the Knife" in the Bertolt Brecht and Kurt Weill adaptation, "The Threepenny Opera").
Document 11: Francesco Sacrati: Francesco Sacrati (17 September 1605 in Parma, Italy – 20 May 1650 in Modena, Italy) was an Italian composer of the Baroque era, who played an important role in the early history of opera. He wrote for the Teatro Novissimo in Venice as well as touring his operas throughout Italy. His most famous piece is "La finta pazza" ("The Feigned Madwoman", 1641), said to be the first opera ever performed in France (in 1645). The manuscript of this work was long thought to be lost but a touring edition of the manuscript was discovered by musicologist Lorenzo Bianconi in 1984. Some of the music bears striking similarities to the score of Monteverdi's "L'incoronazione di Poppea", prompting scholars to speculate that Sacrati had a part in composing the surviving version of that opera. The United States premiere of "La finta pazza", and first performance outside Europe, occurred in April 2010 at Yale University.
Document 12: The Bear (opera): The Bear is the second of the two operas by William Walton, described in publication as an "Extravaganza in One Act". The libretto was written by Paul Dehn and Walton, based on the play of the same title by Anton Chekhov (which is also sometimes translated into English as "The Boor").
Document 13: L'incoronazione di Poppea discography: These lists show the audio and visual recordings of L'incoronazione di Poppea by Claudio Monteverdi. The opera was premiered in Venice in 1642-43, but after a 1651 revival in Naples it remained unperformed for 250 years. It began to enter the general opera repertory in the 1960s, and thereafter was increasingly performed in leading opera houses and festivals.
Document 14: Lost operas by Claudio Monteverdi: The Italian composer Claudio Monteverdi (1567–1643), in addition to a large output of church music and madrigals, wrote prolifically for the stage. His theatrical works were written between 1604 and 1643 and included ten operas, of which three—"L'Orfeo" (1607), "Il ritorno d'Ulisse in patria" (1640) and "L'incoronazione di Poppea" (1643)—have survived with their music and librettos intact. In the case of the other seven operas, the music has disappeared almost entirely, although some of the librettos exist. The loss of these works, written during a critical period of early opera history, has been much regretted by commentators and musicologists.
Document 15: The Immortal Hour: The Immortal Hour is an opera by English composer Rutland Boughton. Boughton adapted his own libretto from the works of Fiona MacLeod, a pseudonym of writer William Sharp.
ground_truth: yes