Before the 1979 Revolution, the Iranian national stage had become a famous performing scene for known international artists and troupes, with the Roudaki Hall of Tehran constructed to function as the national stage for opera and ballet. Opened on 26 October 1967, the hall is home to the Tehran Symphony Orchestra, the Tehran Opera Orchestra, and the Iranian National Ballet Company, and was officially renamed ''Vahdat Hall'' after the 1979 Revolution.