Columbia subject headings:
Metropolitan Opera (New York, N.Y.)
Opera--New York (State)--New York.
Radio and music--New York (State)--New York.
Radio and music--Québec (Province)
Harvard subject headings:
Metropolitan Opera (New York, N.Y.)
Opera--New York (State)--New York
Radio and music--New York (State)--New York.
Radio and music--Québec (Province)
Princeton subject headings:
Metropolitan Opera (New York, N.Y.)
Opera--New York (State)--New York.
Radio and music--New York (State)--New York.
Radio and music--Québec (Province).