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
La Scala a memorable concert conducted by Arturo Toscanini—twice La Scala's principal conductor and an associate of the composers Giuseppe Verdi and Giacomo Puccini—with a soprano solo by Renata Tebaldi, which created a sensation. La Scala hosted the first productions of many famous operas, and had a special relationship with Verdi. For several years, however, Verdi did not allow his work to be played here, as some of his music had been modified (he said "corrupted") by the orchestra. This dispute originated in a disagreement over the production of his "Giovanna d'Arco" in 1845; however the composer later conducted his "Requiem" there