The Norwegian National Opera & Ballet is the largest stage for music theatre and dance in the country. The Norwegian Opera & Ballet consists of two companies, the National Opera and The National Ballet. The Norwegian Opera was founded in 1957 and gave its opening performance in 1959. The Norwegian National Opera & Ballet is organised as a limited company and is 90 percent state-owned, 10 percent owned by The Norwegian Opera Fund. The Opera house On June 15 1999 the National Assembly (Stortinget) approved the building of a new opera house in Oslo. In 2000, Norwegian architect firm Snøhetta was chosen as winner of the anonymous architectural competition. Groundworks began in 2003, with Statsbygg as property manager. On April 12 2008 the new opera house opened with a Gala Performance.