Question: The composer of the opera "The Zoo" has composed how many major orchestral works?

full_context: Document 1: King Arthur (opera): King Arthur, or The British Worthy (Z. 628), is a semi-opera in five acts with music by Henry Purcell and a
Document 2: The Zoo: The Zoo is a one-act comic opera, with music by Arthur Sullivan and a libretto by B. C. Stephenson, writing under the pen name of Bolton Rowe. It premiered on 5 June 1875 at the St. James's Theatre in London (as an afterpiece to W. S. Gilbert's "Tom Cobb"), concluding its run five weeks later, on 9 July 1875, at the Haymarket Theatre. There were brief revivals in late 1875, and again in 1879, before the opera was shelved.
Document 3: Edward Solomon: Edward Solomon (25 July 1855 – 22 January 1895) was a prolific English composer, as well as a conductor, orchestrator and pianist. He died at age 39 by which time he had written dozens of works produced for the stage, including several for the D'Oyly Carte Opera Company, including "The Nautch Girl" (1891). Early in his career, he was a frequent collaborator of Henry Pottinger Stephens. He had a bigamous marriage with Lillian Russell in the 1880s.
Document 4: Onward, Christian Soldiers: "Onward, Christian Soldiers" is a 19th-century English hymn. The words were written by Sabine Baring-Gould in 1865, and the music was composed by Arthur Sullivan in 1871. Sullivan named the tune "St. Gertrude," after the wife of his friend Ernest Clay Ker Seymer, at whose country home he composed the tune. The Salvation Army adopted the hymn as its favoured processional. The piece became Sullivan's most popular hymn. The hymn's theme is taken from references in the New Testament to the Christian being a soldier for Christ, for example II Timothy 2:3 (KJV): "Thou therefore endure hardness, as a good soldier of Jesus Christ."
Document 5: Stinkfoot, a Comic Opera: Stinkfoot, a Comic Opera is an English musical with book, music, and lyrics by Vivian Stanshall and Ki Longfellow-Stanshall written for the Crackpot Theatre Company aboard the Old Profanity Showboat in Bristol, England. The show is based on a series of tales written by Longfellow about Stinkfoot, a New York City alley cat, a bit of a rogue and more than a bit of a rake. It had been intended for children, but when told by a New York City literary agent that “No mother in America would want her child identifying with Stinkfoot the alley cat, never mind its name,” the story went into a drawer for many years. It came out with the meeting in 1977 of Vivian and Ki, at which point the story became bedtime reading for Vivian's son Rupert Stanshall (born 1968), and later for his daughter with Ki, Silky Longfellow-Stanshall (born 1979). In 1985 it “grew up” when Vivian and Ki decided to base a musical on its lead character, Stinkfoot. At that point, it became a melding of two very different visions and two very different musical traditions: Vivian’s days as frontman for the Bonzo Dog Band and his childhood in Leigh-on-Sea with Ki’s love of America’s Broadway.
Document 6: Arthur Sullivan: 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".
Document 7: Giulio Sabino: The opera, staged in six or seven European countries at the end of the 18th century, was the subject of a parody in Antonio Salieri's 1786 work "Prima la musica e poi le parole".
Document 8: 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 9: The Spectre Knight: The Spectre Knight is a one-act "fanciful operetta" with a libretto by James Albery and music by Alfred Cellier. It was first performed on 9 February 1878 at the Opera Comique by the Comedy Opera Company as a companion piece to "The Sorcerer". The piece continued to run until 23 March 1878 and was revived by the company from 28 May 1878 to 10 August 1878 as a companion piece to "H.M.S. Pinafore". The piece had a run in New York in 1880 and was toured in Britain and America.
Document 10: List of compositions by Arthur Sullivan: The following is a list of musical works by the English composer Arthur Sullivan, best known for his operatic collaborations with W. S. Gilbert. In all, Sullivan's artistic output included 23 operas, 13 major orchestral works, eight choral works and oratorios, two ballets, one song cycle, incidental music to several plays, numerous hymns and other church pieces, and a large body of songs, parlour ballads, part songs, carols, and piano and chamber pieces.
Document 11: Engelbert Humperdinck (composer): Engelbert Humperdinck (] ; 1 September 1854 – 27 September 1921) was a German composer, best known for his opera "Hansel and Gretel".
Document 12: Samuel James Arnold: Samuel James Arnold (1774–1852) was an English dramatist and theatrical manager. Under his management the Lyceum Theatre, London became the English Opera House, and staged the first English productions of many operas, including in 1824 Carl Maria von Weber's "Der Freischütz".
Document 13: Major-General's Song: "I Am the Very Model of a Modern Major-General" (often referred to as the "Major-General's Song" or "Modern Major-General's Song") is a patter song from Gilbert and Sullivan's 1879 comic opera "The Pirates of Penzance". It is perhaps the most famous song in Gilbert and Sullivan's operas. It is sung by Major General Stanley at his first entrance, towards the end of Act I. The song satirises the idea of the "modern" educated British Army officer of the latter 19th century. It is one of the most difficult patter songs to perform, due to the fast pace and tongue-twisting nature of the lyrics.
Document 14: A Song to Sing, O: A Song to Sing, O is a one-man musical play by Melvyn Morrow with songs by Gilbert and Sullivan and by George Grossmith, about the life of comedian and actor George Grossmith, who originated the principal comic roles for the most famous Savoy operas from 1877 through the 1880s. The plot concerns a fictional backstage interview given by Grossmith to an American reporter in 1889 during his last performance of "The Yeomen of the Guard" – indeed, his last performance for the D'Oyly Carte Opera Company (although he did return briefly in 1897 in "His Majesty"). In between some interview gossip, Grossmith sings Gilbert and Sullivan songs, and some of his own songs to the reporter, and he enacts a scene from Grossmith's book, "The Diary of a Nobody".
Document 15: Benjamin Britten: Edward Benjamin Britten, Baron Britten {'1': ", '2': ", '3': ", '4': "} (22 November 1913 – 4 December 1976) was an English composer, conductor and pianist. He was a central figure of 20th-century British classical music, with a range of works including opera, other vocal music, orchestral and chamber pieces. His best-known works include the opera "Peter Grimes" (1945), the "War Requiem" (1962) and the orchestral showpiece "The Young Person's Guide to the Orchestra" (1945).
ground_truth: 13