Question: What instrument was the musician taught at the school that was founded in 1880?

Context paragraphs:
Iran Bethel School: Iran Bethel School (1874 ~ 1968) was established as an American missionary organization for women in Tehran in 1874.  Annie Woodman Stocking Boyce- born in Wiscasset, Maine, on 7 January 1880, worked as a Presbyterian missionary in Iran from 1906 until her retirement in 1949.  She was assigned to teach in Iran Bethel School for girls.  During her first year in Tehran she led morning chapel for the Persian speaking group [in Iran Bethel School]….  Taught Bible to all grades in Persian. .  taught a great variety of subjects in English.  In 1918 she became the President of the Alumnae Association of Iran Bethel School.  And she began to use this organization as a forum for transforming Iranian women lives.

Ronnie Aldrich: Ronnie Aldrich (born Ronald Frank Aldrich; 15 February 1916, Erith, Kent, England – 30 September 1993, Isle of Man) was a British easy listening and jazz pianist, arranger, conductor, and composer.  The only son of a store manager, he was three years old when he started playing the piano.  He was educated at the Harvey Grammar School, Folkestone, and taught violin at the Guildhall School of Music and Drama.  Before the Second World War, Aldrich went to India to play jazz and first gained fame in the 1940s as leader of the Squadronaires, up until their disbanding in 1964.

Los Gatos High School: Los Gatos High School (LGHS) is a high school in Los Gatos, California, a small high income town near San Jose in the Silicon Valley.  Los Gatos High School was founded in 1908 and is part of the Los Gatos-Saratoga Joint Union High School District and is home to a large number of Silicon Valley Executives' teenagers.  During the late 1880s up until the establishment of Los Gatos High School, high school age students were taught at Los Gatos Central School, a grammar school which was established in 1886.

Reed Ghazala: Qubais Reed Ghazala (born 1953), an American author, photographer, composer, musician and experimental instrument builder, is recognized as the "father of circuit bending," having discovered the technique in 1966, pioneered it, named it, and taught it ever since.  He has built experimental instruments for many prominent musicians and media companies including Tom Waits, Peter Gabriel, King Crimson, The Rolling Stones, and MTV, among others.  Ghazala's work has been covered globally in the press and can be found being taught world-wide.

Warner &amp; Swasey Company: The Warner & Swasey Company was an American manufacturer of machine tools, instruments, and special machinery.  It operated as an independent business firm, based in Cleveland, from its founding in 1880 until its acquisition in 1980.  It was founded as a partnership in 1880 by Worcester Reed Warner (1846–1929) and Ambrose Swasey (1846–1937).  The company was best known for two general types of products: astronomical telescopes and turret lathes.  It also did a large amount of instrument work, such as equipment for astronomical observatories and military instruments (rangefinders, optical gunsights, etc.) The themes that united these various lines of business were the crafts of toolmaking and instrument-making, which have often overlapped technologically.  In the decades after World War II, it also entered the heavy equipment industry with its acquisition of the Gradall brand.

Harald Ende: Harald Ende (born February 15, 1929, Hamburg, Germany) is a German saxophone, flute and accordion player who was active in the Hamburg music scene from the 1950s to the 1990s.  He attended the local music school and was trained as a classical clarinetist.  However, upon graduating, he soon found that in order to get steady work, he had to play in a more popular context.  In 1958, he joined the NDR (Norddeutscher Rundfunk, or North German Radio) big band.  He also worked as a studio musician for many popular German recording acts like Bert Kaempfert.  In 1968, he joined the James Last Orchestra, for which he had to learn how to play the flute; James Last himself taught Ende how to play the instrument.  A big band musician enamoured with the work of Buddy Rich and Count Basie, Ende recorded and toured with Last until the end of 1979, after which he devoted most of his career to his work with the NDR big band, often backing up well-known jazz stars like Joe Pass and Chet Baker.  One popular sideline act was his accordion duo with fellow Last and Kaempfert bandmate Günter Platzek, known as The Pop Kids.  Now retired, Ende took part in the 80th anniversary celebration of the birth of Bert Kaempfert in 2003.

Guildhall School of Music and Drama: The Guildhall School of Music and Drama is an independent music and dramatic arts school which was founded in 1880 in London, England.  Students can pursue courses in music, opera, drama and technical theatre arts.

John Murphy (fiddle player): John (Boss) Murphy (1875–1955) from The Leap, Churchtown, Co.  Cork was a former farmer by profession, but possessed a keen interest in fiddle playing, and was renowned locally for his ability on the instrument.  His father, William Murphy (1829–1911), was both a fiddle player and maker, indeed John was the proud owner of an instrument that had been made by his father.  John’s father was his first fiddle teacher.  His siblings, a brother and three sisters, also played the instrument but their interest in music waned as they reached adulthood and they did not continue to play.  John’s musical literacy was also gained primarily from his father, who had learnt to read music at a hedge school at Ballygrace in the locality taught by a Thomas Croke.  The same Thomas Croke, many years later, stayed for long periods of time in the Murphy household and would undoubtedly also have taught the young John directly.

Gurdev Singh (musician): Gurdev Singh (born 15 January 1948) is an Indian-born musician based in London who plays the plucked string instrument "sarod".  Singh studied under "sarod" player Amjad Ali Khan, can play the instrument "dilruba", and sings Hindustani classical music.  He performed on the 1993 album "Fate of Nations" by English rock singer Robert Plant.  Singh has played internationally and taught students in England.

Hugo Walter Voigtlander: Hugo Walter Voigtlander (November 8, 1859 – January 7, 1933) was a German-American musician who played violin, viola, and viola d'amore.  He was also an instrument maker, and a collector and arranger of viola d'amore music.  As a youth he studied at the Royal Conservatory of Music in Leipzig and played violin and viola in several professional orchestras in Germany.  He emigrated to the United States in 1885 where he spent ten years playing viola and viola d'amore with various professional chamber groups in and around Detroit, Michigan.  He then spent two years in Pittsburgh, Pennsylvania playing in the Pittsburgh Symphony Orchestra, and in 1897 moved to New York City, where he played in a number of professional orchestras.  In addition to playing viola d'amore, Walter Voigtlander taught viola d'amore, and made and collected numerous arrangements for the instrument.

Supporting paragraphs: Ronnie Aldrich Guildhall School of Music and Drama
Answer: violin