Question: What nationality is the concertmaster of the principal opera company in Australia?

Context paragraphs:
Israel National Opera: The Israel National Opera was Israel's principal opera company from its founding in 1947 until its demise in 1982.  It was founded by the American soprano Edis de Phillipe and had staged over 1000 performances throughout Israel by 1958.  The scarcity of trained Israeli opera singers led the company to bring in international guest artists.  During the early 1960s both Plácido Domingo and his wife Marta Ornelas were principal singers with the company.  Lack of government funding led to the company's final closure in 1982 after several years of financial problems.

Philadelphia Lyric Opera Company: The Philadelphia Lyric Opera Company was an American opera company located in Philadelphia, Pennsylvania that was active between 1958 and 1974.  The company was led by a number of Artistic Directors during its history, beginning with Aurelio Fabiani.  Other notable Artistic Directors include Julius Rudel and Anton Guadagno (1966–1972).  The company produced between four and six of their own operas every year in addition to sponsoring numerous traveling productions from the New York City Opera.  In 1975 the company merged with the Philadelphia Grand Opera Company but retained its original name.  With the combined resources of both companies, the Philadelphia Lyric Opera Company began producing higher quality productions with name artists such as Luciano Pavarotti, Joan Sutherland, Roberta Peters, Montserrat Caballé, and others.  For the bicentennial year 1976, the company commissioned famed opera composer Gian Carlo Menotti to create a new opera.  The work, The Hero, premiered on June 1, 1976.  In 1980, the company artistically reorganized to form the Opera Company of Philadelphia.

Opéra Bastille: The Opéra Bastille (    ) (Bastille Opera House) is a modern opera house in Paris, France.  Inaugurated in 1989 as part of President François Mitterrand’s “"Grands Travaux"”, it became the main facility of the Paris National Opera, France's principal opera company, alongside the older Palais Garnier; most opera performances are shown at the Bastille along with some ballet performances and symphony concerts, while "Garnier" presents a mix of opera and ballet performances.

English National Opera commissions and premieres: English National Opera (ENO) is an opera company based in London, resident at the London Coliseum in St. Martin's Lane.  It is one of the two principal opera companies in London, along with the Royal Opera, Covent Garden.  ENO's productions are sung in English.  The company, formerly known as Sadler's Wells Opera, has long had a policy of commissioning new works, and has staged many world and British premieres.

Aubrey Murphy (violinist): Aubrey Murphy is an Irish violinist who is concertmaster of the Opera Australia orchestra.

Opera Australia: Opera Australia is the principal opera company in Australia.  Based in Sydney, its performance season at the Sydney Opera House accompanied by the Australian Opera and Ballet Orchestra runs for approximately eight months of the year, with the remainder of its time spent in the Arts Centre Melbourne, where it is accompanied by Orchestra Victoria.  In 2004, the company gave 226 performances in its subscription seasons in Sydney and Melbourne, attended by more than 294,000 people.

Michigan Opera Theatre: Michigan Opera Theatre (MOT) is the principal opera company in Michigan, USA.  The company is based in Detroit, where it performs in the Detroit Opera House.  Each year it presents an opera and dance season.  The company presents four operas in their original language with English supertitles and hosts dance companies with touring repertoire.  It also presents musical theatre performances.  The company has an orchestra, chorus, children's chorus, and extensive dance and arts education outreach programs.  In 2005 MOT won a National Endowment for the Arts, "Access to Artistic Excellence" grant to support its staging of the world premiere of "Margaret Garner".

Max Maretzek Italian Opera Company: The Max Maretzek Italian Opera Company (sometimes referred to as the Italian Opera Company, the Italian Grand Opera Company, or Academy of Music Opera Company) was a touring American opera company that performed throughout the United States from 1849-1878.  The first major opera company in Manhattan and one of the first important companies in the United States, it had a long association with the Academy of Music in New York City where it presented an annual season of opera from 1854 until the company's demise in 1878 There the company performed the United States premieres of "Rigoletto", "Il trovatore", and "La traviata" among other works.

The Royal Opera: The Royal Opera is a company based in central London, resident at the Royal Opera House, Covent Garden.  Along with the English National Opera, it is one of the two principal opera companies in London.  Founded in 1946 as the Covent Garden Opera Company, it was known by that title until 1968.  It brought a long annual season and consistent management to a house that had previously hosted short seasons under a series of impresarios.  Since its inception, it has shared the Royal Opera House with the dance company now known as The Royal Ballet.

Israeli Opera: The Israeli Opera, formerly known as the New Israeli Opera, is the principal opera company of Israel.  It was founded in 1985 after lack of Israeli government funding led to the demise of the Israel National Opera.  Since 1994 the Tel Aviv Performing Arts Center has been its main performance venue.  The company also founded the Israeli Opera Festival which has performed large-scale outdoor productions, originally at Caesarea, and from 2010 in Masada.

Supporting paragraphs: Aubrey Murphy (violinist) Opera Australia
Answer: Irish