Opera Australia Orchestra associated with working in the Sydney Opera House orchestra pit. The OAO provides orchestral accompaniment to Opera Australia and The Australian Ballet and is one of the few opera orchestras in the world that operates in a repertory style of operation over a period, or season, that can be some months in length. Other opera houses that operate this way are The Metropolitan Opera in New York City, The Royal Opera House Covent Garden in London and La Scala, Milan. 'Repertory style' also infers that over time, certain composers and operas become considered 'standard' to the working operation of the
Metropolitan Opera House (Philadelphia) Academy of Music for the 1920-1921 opera season, the MOH became the home of the Philadelphia Civic Opera Company until 1928. The Philadelphia Grand Opera Company and the Philadelphia La Scala Opera Company, two companies that primarily performed at the Academy of Music, also occasionally performed there during the 1920s and 1930s. The MOH was also host to many traveling productions by opera companies from other cities. The last opera production mounted at the MOH was a double billing of "Cavalleria rusticana" and "Pagliacci" under the baton of Aldo Franchetti, presented by the Chicago Grand Opera Company on May 5,