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 citing "hostility" from staff members. In May 2005, Stéphane Lissner, formerly head of the Aix-en-Provence Festival, was appointed General Manager and Artistic Director of La Scala, becoming the first non-Italian in its history to hold the office. On 15 May 2006, Daniel Barenboim was named "Maestro Scaligero", or "de facto" principal guest conductor, of the company. In October 2011, Barenboim was appointed the next music director of La Scala, effective December 2011, with an initial contract of 5 years. In December 2013, management named Riccardo Chailly the next music director of La Scala, effective 1 January 2015. Stéphane Lissner left