American Light Opera Company was created in 1960.
American Opera Company ended in 1930.
An American Opera was created in 2007.
Century Opera Company was created in 1913.
Philadelphia Opera Company was created in 1938.
Boston Opera Company was created in 1908.
Canadian Opera Company was created in 1950.
Chicago Opera Company was created in 1940.
Berkshire Opera Company was created in 1962.
Aborn Opera Company was created in 1895.
Knoxville Opera Company was created in 1978.
Manhattan Opera Company was created in 1906.