American Light Opera Company was created in 1960.
American Opera Company ended in 1930.
An American Opera was created in 2007.
Canadian Opera Company was created in 1950.
Chicago Opera Company was created in 1940.
Birmingham Opera Company was created in 1987.
Boston Opera Company was created in 1908.
Lancaster Opera Company was created in 1951.
Century Opera Company was created in 1913.
Berkshire Opera Company was created in 1962.
Philadelphia Opera Company was created in 1938.
Beecham Opera Company was created in 1915.