Context_1 : Longy School of Music of Bard College is a conservatory located near Harvard Square in Cambridge, Massachusetts. Founded in 1915 as the Longy School of Music, it was one of the four independent degree-granting music schools in the Boston region along with the New England Conservatory, Berklee College of Music, and Boston Conservatory. In June 2011, the school announced plans to merge with Bard College, and on April 1, 2012, the institution officially became Longy School of Music of Bard College. As of the 2017–18 academic year, the conservatory has 300 students in its degree programs from 35 states and 23 countries. Context_2 : The New England Opera Theatre (later known as the Goldovsky Opera Theater) was an American opera company that was active from 1945 to 1985. Founded by Boris Goldovsky in January 1945, the company was originally based in Boston, Massachusetts. It was initially established under the sponsorship of the New England Conservatory as a training ground for young opera singers. The company became independent and moved to New York in the 1950s and enjoyed four decades of touring during which young singers were trained for operatic careers. Many of them went on to sing at the Metropolitan Opera and other leading houses. The company disbanded upon Goldovsky's retirement in 1985. Context_3 : Burr Van Nostrand (born 1945) is an American classical composer and cellist. He is known for his avant-garde works which use aleatory and graphic notation and were composed from the 1960s through the 1980s. Van Nostrand was born in Los Angeles and began composing while still in high school in San Diego. He studied cello at Yale with Aldo Parisot and composition at the New England Conservatory under Robert Cogan. After his graduation from the NEC with a Masters in Music in 1971, he spent four years in the Netherlands at the Gaudeamus Foundation where several of his works were premiered. He stopped composing in the late 1980s but remained active as a cellist until 2000. There was renewed interest in his music following a concert of his early works at the New England Conservatory in 2012 and the release of a CD the following year containing his 1969 "Voyage in a White Building I" and two other works from that period. Context_4 : Junetta Jones (born March 12, 1936) was an American operatic soprano. A Baltimore native, she was a graduate of [[Frederick Douglass Senior High School (Baltimore, Maryland)|Frederick Douglass Senior High School. After spending a year at Morgan State College(now University), she was awarded a three-year scholarship to the [[Peabody Conservatory]] where she earned a diploma in 1961 and studied singing with [[Joseph Laderoute]]. She then pursued further studies at the [[New England Conservatory]] where she earned a [[Master of Music]] in 1963 and was a pupil of [[Gladys Miller]]. She studied at the [[Tanglewood Music Center]] in the summer of 1961. In 1963 she won the [[Metropolitan Opera National Council Auditions]]. She made her debut at the [[Metropolitan Opera]] on [[Halloween]] of 1963 as the Celestial Voice in [[Giuseppe Verdi]]'s "[[Don Carlos]]" with [[Richard Tucker]] in the title role. She sang two seasons at the Met, with other roles including the 1st Genie in "[[The Magic Flute]]", the Page in "[[Rigoletto]]", and Barbarina in "[[The Marriage of Figaro]]". From 1965-1969 she performed with major opera houses in Europe. She worked for 20 years on the advisory committee for art and culture for the city of Baltimore. Context_5 : Georges C. Mager (1885–1950) was a French musician, and principal trumpet with the Boston Symphony Orchestra from 1919 until his death in 1950. He was a renowned trumpeter in Paris before the First World War, playing at the Paris Opera, Concerts Lamoureux, and the Concerts of the Society of the Conservatory. He also had an alternate career as a singer in the duo with his wife Claire, a well-known soprano, and had hoped for an operatic career. After serving in the French army during the war he came to America as flugelhorn soloist with the Garde Republicaine Band and was engaged to play in the Boston Symphony, first as a violist, since there was no vacancy for trumpet, sharing a stand with Arthur Fiedler. He assumed the first trumpet position in 1920. Trained in France, he was a student of J. Mellet (a student of Jean-Baptiste Arban) at the Paris Conservatory. He was an advocate of use of the C trumpet as an orchestral instrument and had great influence on its development and acceptance in America, working most notably with Vincent Bach. He also was the first trumpeter in America to play Bach's Brandenburg Concerto in the original high tessitura. Mager was on the faculty of the New England Conservatory, and was a teacher to some of the most influential trumpeters of the mid-twentieth century, including Adolph Herseth (who became principal trumpet of the Chicago Symphony Orchestra), Roger Voisin (who replaced Mager as principal trumpet of the Boston Symphony Orchestra in 1950, Bernard Adelstein (who became principal trumpet of the Cleveland Orchestra), Irving Sarin (who became principal trumpet of the Pittsburgh Symphony Orchestra and respected teacher in his own right), and Renold Schilke (who joined the trumpet section of the Chicago Symphony Orchestra and later became an important trumpet maker). He was also teacher to jazz trumpeter Leon Merian. Context_6 : Bonnie Bird Theatre is the 300-seat main performing venue of the Laban Dance Centre of the Trinity Laban Conservatoire of Music and Dance in London, England. Context_7 : Shirish Korde (born June 18, 1945), is a composer who was born in Uganda to Indian parents. He is the Chair of the Music Department at the College of the Holy Cross (Worcester, MA) and has previously been on the faculty of the Berklee College of Music, the New England Conservatory, and Brown University. Korde studied jazz and composition at the Berklee College of Music, analysis and composition at the New England Conservatory, and ethnomusicology at Brown University. Context_8 : Antioch University West - San Francisco (AUW) was located in San Francisco, California. It was one of many campuses formed by Antioch University, a national university, which had its genesis with Antioch College in Yellow Springs, Ohio in 1852. The San Francisco campus closed in July, 1989. The current campuses include Antioch University New England (Keene NH), Antioch University Midwest, (Yellow Springs, OH), Antioch University Los Angeles, Antioch University Santa Barbara and Antioch University Seattle. Antioch College was closed financial reasons effective June 30, 2008. On September 4, 2009, the college's assets were transferred to an independent corporation known as Antioch College Continuation Corporation (ACCC). ACCC reopened the College as an independent institution in the fall of 2011. It operates under the name "Antioch College" by virtue of a license from Antioch University. Context_9 : Elsie Ruth Anderson (never married; 23 June 1907 Newport, Rhode Island – 24 November 1989 Boston, Massachusetts) was an American musicologist, meteorologist, and editor. Anderson attended the New England Conservatory of Music from 1924 to 1931, again in 1934, and again from 1940 to 1941. On June, 23, 1931, Anderson received a Diploma in Orchestra with a concentration in Violin from the New England Conservatory of Music. Context_10 : Trinity Laban Conservatoire of Music and Dance is a music and dance conservatoire based in London, England. It was formed in 2005 as a merger of two older institutions – Trinity College of Music and Laban Dance Centre. Today the conservatoire has 985 undergraduate and postgraduate students based at three campuses in Greenwich (Trinity), Deptford/New Cross (Laban) and New Cross (Laurie Grove) in London. fact_1 : Bonnie Bird Theatre is the 300-seat main performing venue of the Laban Dance Centre of the Trinity Laban Conservatoire of Music and Dance in London, England. fact_2 : Trinity Laban Conservatoire of Music and Dance is a music and dance conservatoire based in London, England. fact_3 :  Today the conservatoire has 985 undergraduate and postgraduate students based at three campuses in Greenwich (Trinity), Deptford/New Cross (Laban) and New Cross (Laurie Grove) in London. Answer: three
Output: How many campuses does the England conservatory which houses the Bonnie Bird Theatre have?