Question: Biographies of the composer of Il re pastore is the main subject of what?

full_context: Document 1: Il pastor fido: Il pastor fido (The Faithfull Shepherd in Richard Fanshawe's 1647 English translation) is a pastoral tragicomedy set in Arcadia by Giovanni Battista Guarini, first published in 1590 in Venice.
Document 2: Wolfgang Amadeus Mozart: Wolfgang Amadeus Mozart (/ ˈwʊlfɡæŋ æməˈdeɪəs ˈmoʊtsɑːrt / MOHT - sart; German: (ˈvɔlfɡaŋ amaˈdeːʊs ˈmoːtsaʁt); 27 January 1756 -- 5 December 1791), baptised as Johannes Chrysostomus Wolfgangus Theophilus Mozart, was a prolific and influential composer of the Classical era.
Document 3: Armida abbandonata: Armida Abbandonata ("Armida Abandoned") is an opera in three acts by the Italian composer Niccolò Jommelli. The libretto, by Francesco Saverio De Rogatis, is based on the epic poem "Jerusalem Delivered" by Torquato Tasso. The opera was first performed at the Teatro San Carlo, Naples on 30 May 1770. The young Wolfgang Amadeus Mozart was in the audience. He described the work as "beautiful but too serious and old-fashioned for the theatre". Nevertheless, despite a lukewarm reception at its premiere, "Armida abbandonata" was widely performed throughout Italy in the following years.
Document 4: Franz Xaver Wolfgang Mozart: Franz Xaver Wolfgang Mozart (26 July 1791 – 29 July 1844), also known as Wolfgang Amadeus Mozart, Jr., was the youngest child of six born to Wolfgang Amadeus Mozart and his wife Constanze. He was the younger of his parents' two surviving children. He was a composer, pianist, conductor, and teacher from the late classical period whose musical style was of an early Romanticism, heavily influenced by his father's mature style.
Document 5: Atys (Piccinni): In 1783 there was a second version of the opera produced by Piccinni and Marmontel. In order to satisfy the current trends in opera, they changed the ending to a "lieto fine", or happy ending, by rewriting entire sections of the original opera. In this second version "Atys" was returned to the stage of the Opéra in 1783, 1784, 1791 and 1792. In all, it was mounted at the Opéra on 65 dates before being dropped for good.
Document 6: Così fan tutte: Così fan tutte, ossia La scuola degli amanti (Italian: (koˈsi ffan ˈtutte osˈsiːa la ˈskwɔːla deʎʎ aˈmanti; koˈzi); Thus Do They All, or The School for Lovers), K. 588, is an Italian - language opera buffa in two acts by Wolfgang Amadeus Mozart first performed on 26 January 1790 at the Burgtheater in Vienna, Austria. The libretto was written by Lorenzo Da Ponte who also wrote Le nozze di Figaro and Don Giovanni.
Document 7: Symphony, K. 45b (Mozart): This work was only known to Ludwig Ritter von Köchel as an incipit in the catalogue of Breitkopf & Härtel, and thus it was placed in the Anhang as K. Anh. 214. Alfred Einstein then discovered a set of parts in the Berlin State Library with the title ""Synfonia Ex Bb...Del Sigr. cavaliere Amadeo Wolfgango Mozart Maestro di concerto di S.A. á Salisburgo"". Wolfgang became the Concertmaster to the Archbishop of Salzburg in November 1769, and was given the title "cavaliere" in July 1770, but as this is a later copy, this information cannot be used for dating purposes. Einstein believed the symphony to date from early 1768 on stylistic grounds; Neal Zaslaw and Gerhard Allroggen believe even earlier dates to also be possible, and Zaslaw dated the symphony cautiously to Salzburg in 1767. Einstein also believed that the symphonies in the catalogue of Breitkopf & Härtel were sent by Leopold Mozart to be published.
Document 8: Betulia liberata: The Mozart is the best known, if only because the composer's output receives more examination. Composed in March to July 1771 when Mozart was 15 years old, K. 118 (74c) is a 140-minute "azione sacra" on a text by Metastasio tracing the story of Judith and Holofernes from the biblical "". It was commissioned in March 1771 by Giuseppe Ximenes, Prince of Aragon, while Mozart and his father Leopold were on the way home to Salzburg from their first journey to Italy. It is the only oratorio Mozart ever wrote. Its two parts comprise sixteen arias, with solo or choral parts, scored for soloists, choir and orchestra. Not performed in Mozart's lifetime, "La Betulia liberata" is shaped stylistically to works by Leonardo Leo and Johann Adolph Hasse.
Document 9: Il re pastore: Metastasio wrote the libretto in 1751, basing it on a work by Torquato Tasso called "Aminta". The libretto was picked up when Mozart (just 19 at the time) and his father saw a performance of it set to music composed by Felice Giardini – Mozart's version, however was two acts rather than Giardini's three, and has a few substantial changes. Each act lasts for around an hour in performance. The Salzburg court chaplain Varesco was largely responsible for this editing of Metastasio's libretto.
Document 10: Se vuol ballare: The cavatina "" is an aria for baritone or bass from the first act of the opera "The Marriage of Figaro" by Wolfgang Amadeus Mozart. The libretto was written by Lorenzo Da Ponte based on a stage comedy by Pierre Beaumarchais, La folle journée, ou le Mariage de Figaro (1784). The Italian title means "If you want to dance".
Document 11: Symphony No. 41 (Mozart): Wolfgang Amadeus Mozart completed his Symphony No. 41 in C major, K. 551, on 10 August 1788. The longest and last symphony that he composed, it is regarded by many critics as among the greatest symphonies in classical music.
Document 12: Biographies of Mozart: Wolfgang Amadeus Mozart died after a short illness on 5 December 1791, aged 35. His reputation as a composer, already strong during his lifetime, rose rapidly in the years after his death, and he became (as he has remained to this day) one of the most celebrated of all composers.
Document 13: Mozart's birthplace: Mozart's birthplace (German: ' or ') was the birthplace of Wolfgang Amadeus Mozart at No. 9 Getreidegasse in Salzburg, Austria. The Mozart family resided on the third floor from 1747 to 1773. Mozart himself was born here on 27 January 1756. He was the seventh child of Leopold Mozart, who was a musician of the Salzburg Royal Chamber.
Document 14: Mitridate, re di Ponto: Mozart wrote "Mitridate" while touring Italy in 1770. The musicologist Daniel E. Freeman has recently demonstrated that it was composed with close reference to the opera "La Nitteti" by Josef Mysliveček. The latter was the opera being prepared for production in Bologna when Mozart met Mysliveček for the first time with his father in March 1770. Mysliveček visited the Mozarts frequently in Bologna during the summer of 1770 while Wolfgang was working on "Mitridate". Mozart gained expertise in composition from his older friend and also incorporated some of his musical motives into his own operatic setting. The opera was first performed at the Teatro Regio Ducal, Milan, on 26 December 1770 (at the Milan Carnival). It was a success, having been performed twenty-one times despite doubts because of Mozart's extreme youth – he was 14 at the time. No revival took place until the 20th century. This opera features virtuoso arias for the principal roles, but only two ensemble numbers: the act 2 ending duet between Aspasia and Sifare ("Se viver non degg’io"), and the brief quintet that ends the opera, very characteristic of standard baroque opera seria where the opera ends with a short "coro" or "tutti" number.
Document 15: Wolfgang Amadeus Mozart: Wolfgang Amadeus Mozart was born on 27January 1756 to Leopold Mozart (1719–1787) and Anna Maria, née Pertl (1720–1778), at 9 Getreidegasse in Salzburg. This was the capital of the Archbishopric of Salzburg, an ecclesiastic principality in what is now Austria, then part of the Holy Roman Empire. He was the youngest of seven children, five of whom died in infancy. His elder sister was Maria Anna Mozart (1751–1829), nicknamed "Nannerl". Mozart was baptised the day after his birth, at St. Rupert's Cathedral in Salzburg. The baptismal record gives his name in Latinized form, as "Joannes Chrysostomus Wolfgangus Theophilus Mozart". He generally called himself "Wolfgang Amadè Mozart" as an adult, but his name had many variants.
ground_truth: Wolfgang Amadeus Mozart
sub_queries: Il re pastore >> composer Answer: Mozart
Biographies of Mozart >> main subject Answer: Wolfgang Amadeus Mozart