Question: Alessandro is an opera composed by George Frideric Handel, who composed in what style?

Context articles: Händel-Gesellschaft
List of operas by Handel
George Frideric Handel
Arminio
Alessandro (opera)
Alessandro Severo
Alcina
Amadigi di Gaula
Terpsicore
Scipione

Between 1858 and 1902, the Händel-Gesellschaft ("German Handel Society") produced a collected 105-volume edition of the works of George Frideric Handel.
 Even though the collection was initiated by the society, many of the volumes were published by Friedrich Chrysander working alone (Chrysander was the major contributor for almost all of the volumes).
 The wording on the title page of the volumes is ""Georg Friedrich Händel's Werke.
 Ausgabe der Deutschen Händelgesellschaft"" which translates as "Georg Friedrich Handel's works.
 Edition of the German Handel Society".
 Chrysander's work has been criticised, however the scale of his achievement is also praised.
 The collection's abbreviation of "HG" can be used to identify individual works by Handel; for example Handel's "Messiah" can be referred to as "HG xlv" (with the Roman numerals "xlv" indicating that the work is in volume 45).
 For practical use, the HG system has been superseded by the HWV numbering system.
 The 105 volumes do not contain the complete works of Handel—with at least 250 of his works unpublished in the collection.
George Frideric Handel's operas comprise 42 musical dramas that were written between 1705 and 1741 in various genres.
 He began composing operas in Germany and then for a brief time in Italy to modest success.
 It was not until he moved to England that he found great success in the genre.
 His first opera in England, "Rinaldo" (1711), was met with enthusiasm, and several more Italian operas soon followed.
 However, Handel's place as the central figure of opera in England during the eighteenth century was not solidified until, under the influence of Thomas Arne, he began composing large-scale works with English language texts.
 Though almost all his English language works are technically oratorios and not operas, several of them, such as "Semele" (1743), have become an important part of the opera repertoire.
 Handel's first opera (opera seria - serious Italian opera) was "Almira" (1705).
George Frideric (or Frederick) Handel ( ; born Georg Friedrich Händel ] ; 23 February 1685 (O.S.) [(N.S.) 5 March] – 14 April 1759) was a German, later British, baroque composer who spent the bulk of his career in London, becoming well known for his operas, oratorios, anthems, and organ concertos. Handel received important training in Halle and worked as a composer in Hamburg and Italy before settling in London in 1712; he became a naturalised British subject in 1727.
 He was strongly influenced both by the great composers of the Italian Baroque and by the middle-German polyphonic choral tradition.
Arminio (HWV 36) is an opera composed by George Frideric Handel.
Alessandro (HWV 21), is an opera composed by George Frideric Handel in 1726 for the Royal Academy of Music.
 Paolo Rolli's libretto is based on the story of Ortensio Mauro's "La superbia d'Alessandro".
 This was the first time the famous singers Faustina Bordoni and Francesca Cuzzoni appeared together in one of Handel's operas.
 The original cast also included Francesco Bernardi who was known as Senesino.
Alessandro Severo (Alexander Severus, HWV A13) is an opera by George Frideric Handel composed in 1738.
 It is one of Handel's three pasticcio works, made up of the music and arias of his previous operas "Giustino", "Berenice" and "Arminio".
 Only the overture and recitatives (as well as the words) were new.
 The impresario Johann Jacob Heidegger probably selected the 1717 libretto by Apostolo Zeno, originally written for Antonio Lotti and re-used by many composers thereafter.
Alcina (HWV 34) is an opera seria by George Frideric Handel.
 Handel used the libretto of "L'isola di Alcina", an opera that was set in 1728 in Rome by Riccardo Broschi, which he acquired the year after during his travels in Italy.
 Partly altered for better conformity, the story was originally taken from Ludovico Ariosto's "Orlando furioso" (like those of the Handel operas "Orlando" and "Ariodante"), an epic poem.
 The opera contains several musical sequences with opportunity for dance: these were composed for dancer Marie Sallé.
Amadigi di Gaula (HWV 11) is a "magic" opera in three acts, with music by George Frideric Handel.
 It was the fifth Italian opera that Handel wrote for London and was composed during his stay at Burlington House in 1715.
 It is based on "Amadis de Grèce", a French tragédie-lyrique by André Cardinal Destouches and Antoine Houdar de la Motte.
 Charles Burney maintained near the end of the eighteenth century, "Amadigi" contained "...more invention, variety and good composition, than in any one of the musical dramas of Handel which I have yet carefully and critically examined.”
Terpsicore (HWV)(8b) is a prologue in the form of an opéra-ballet by George Frideric Handel.
 Handel composed it in 1734 for a revision of his opera "Il pastor fido" which had first been presented in 1712.
 The revision of "Il pastor fido" with "Terpsicore" as the prologue was first performed on 9 November 1734 at Covent Garden theatre in London, opening Handel's first season in that newly built theatre.
 "Terpsicore" mixes dance along with solo and choral singing and was patterned after models in French operas, a particular source being "Les festes grecques et romaines" by Louis Fuzelier and Colin de Blamont, first presented in Paris in 1723.
 The work featured the celebrated French dancer Marie Sallé as well as stars of Handel's Italian operas and was a success with audiences of the day.
Scipione (HWV 20) - or Publio Cornelio Scipione - is an opera seria in three acts, with music composed by George Frideric Handel for the Royal Academy of Music (1719) in 1726.
 The librettist was Paolo Antonio Rolli.
 Handel composed "Scipione" whilst in the middle of writing "Alessandro".
 It was based upon the life of Roman General Scipio Africanus.
 Its slow march is the regimental march of the Grenadier Guards and is played at London Metropolitan police passing out ceremonies.