Question: Which composer wrote more operas, Gioachino Rossini or Arthur Sullivan?
Context: Paolo (Pablo) Rosich (1780 – after 1832) was a Spanish-born opera singer and librettist widely known by the Italianized version of his first name.  A skilled comic actor, he performed leading "basso buffo" roles in many Italian opera houses as well as in Lisbon, London, Madrid and New York.  Rosich created the roles of Taddeo in Gioachino Rossini's "L'italiana in Algeri" and Buralicchio in Rossini's "L'equivoco stravagante" and also wrote the librettos for two operas by Manuel García: "L'amante astuto" and "La figlia dell' aria". Giuseppe Farinelli (7 May 1769 – 12 December 1836) was an Italian composer active at the end of the 18th century and the beginning of the 19th century who excelled in writing opera buffas. Considered the successor and most successful imitator of Domenico Cimarosa, the greatest of his roughly 60 operas include "I riti d'Efeso" (1803, Venice), "La contadina bizzarra" (1810, Milan) and "Ginevra degli Almieri" (1812, Venice).  More than 2/3 of his operas were produced between 1800-1810 at the height of his popularity.  With the arrival of Gioachino Rossini his operas became less desirable with the public, and by 1817 his operas were no longer performed.  His other compositions include 3 piano forte sonatas, 3 oratorios, 11 cantatas, 5 masses, 2 Te Deums, a Stabat mater, a Salve regina, a Tantum ergo, numerous motets, and several other sacred works. Bruce Fowler (born 1965) is an American classical tenor who has had a major international performance career in operas and concerts since the early 1990s.  He is particularly known for his appearances in bel canto operas.  His first recording, as the tenor soloist for Handel's "Messiah" with Telarc, was nominated for a Grammy Award.  He has also recorded Gioachino Rossini's "Stabat Mater" for Harmonia Mundi, Rossini's "Armida" for Sony, Jacques Ibert's "Angelique" for Cetra, Georg Philipp Telemann's "Der Tag des Gerichts" and Hugo Weisgall's "Six Characters in Search of an Author" on New World Records. This is a list of the operas of the Italian composer Gioachino Rossini (1792–1868).  See List of compositions by Gioachino Rossini for his other works. Ivanhoé is an 1826 pastiche opera in three acts with music by Gioachino Rossini to a French-language libretto by Émile Deschamps and Gabriel-Gustave de Wailly, after Walter Scott's novel of the same name.  The music was adapted, with the composer's permission, by the music-publisher Antonio Pacini from Rossini's operas, namely "Semiramide", "La Cenerentola", "La gazza ladra", and "Tancredi" in order to introduce his music to Paris.  An examination of the score shows that Pacini also used music from "Bianca e Faliero", "Armida", "Maometto II", "Aureliano in Palmira", "Sigismondo", "Torvaldo e Dorliska", "Mosè in Egitto" and an amount of newly composed music including fanfares and the gallop that was later to become famous from its inclusion in "Guglielmo Tell".  The work was premiered on 15 September 1826, at the Odéon Theatre. Gioachino Antonio Rossini (] ; 29 February 179213 November 1868) was an Italian composer who wrote 39 operas, as well as some sacred music, songs, chamber music and piano pieces. Sir Arthur Seymour Sullivan MVO (13 May 1842 – 22 November 1900) was an English composer.  He is best known for his series of 14 operatic collaborations with the dramatist W. S. Gilbert, including "H.M.S. Pinafore", "The Pirates of Penzance" and "The Mikado".  His works include 23 operas, 13 major orchestral works, eight choral works and oratorios, two ballets, incidental music to several plays, and numerous hymns and other church pieces, songs, and piano and chamber pieces.  The best known of his hymns and songs include "Onward Christian Soldiers" and "The Lost Chord". Zelmira (] ) is an opera in two acts by Gioachino Rossini to a libretto by Andrea Leone Tottola.  Based on the French play, "Zelmire" by de Belloy, it was the last of the composer's Neapolitan operas.  Stendhal called its music Teutonic, comparing it with "La clemenza di Tito" but remarking: "...while Mozart would probably, had he lived, have grown completely Italian, Rossini may well, by the end of his career, have become more German than Beethoven himself!" The critical reputation of the British composer Arthur Sullivan has fluctuated markedly in the 150 years since he came to prominence.  At first, critics regarded him as a potentially great composer of serious masterpieces.  When Sullivan made a series of popular successes in comic operas with the librettist W.S. Gilbert, Victorian critics generally praised the operettas but reproached Sullivan for not writing solemn choral works instead.  Immediately after Sullivan's death, his reputation was attacked by critics who condemned him for not taking part in what they conceived of as an "English musical renaissance".  By the latter part of the 20th century, Sullivan's music was being critically reassessed, beginning with the first book devoted to a study of his music, "The Music of Arthur Sullivan" by Gervase Hughes (1960). Péchés de vieillesse ("Sins of Old Age") is a collection of 150 vocal and solo piano pieces by composer Gioachino Rossini, who was best known for his operas.  The pieces are grouped into fourteen unpublished albums under this self-deprecating and ironic title.  The ordering of the pieces in the albums does not reflect the sequence or the dates of their composition, which range from 1857 to shortly before Rossini's death in 1868.  The title "Péchés de vieillesse" was given by Rossini only to volumes V-IX, but has since been extended to the complete set.
Answer: Gioachino Antonio Rossini