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
Central City Opera House picture theatre. The Opera House closed in 1927. The opera house was donated to the University of Denver in May 1931 by MacFarlane's heirs and restoration was organized by the newly formed Central City Opera House Association. The summer of 1932, actress Lillian Gish opened the newly restored opera house with "Camille". It began a tradition of offering summer opera and theater festivals, which have become nationally recognized. The Central City Opera company was also formed that year. It is fifth the oldest opera company in the United States. One of its popular performances is "The Ballad of Baby Doe",