Columbia subject headings:
Metropolitan Opera (New York, N.Y.)
Opera--New York (State)--New York.
Singers--Biography.
Harvard subject headings:
Metropolitan Opera (New York, N.Y.)
Opera--New York (State)--New York
Singers--Biography
Princeton subject headings:
Metropolitan Opera (New York, N.Y.)
Opera--New York (State)--New York.
Singers--Biography.