Columbia subject headings:
Castrati--Italy--Biography.
Castrati--Italy--History.
Vocal music--Italy--History and criticism.
Harvard subject headings:
Castrati--Italy--Biography.
Castrati--Italy--History.
Vocal music--Italy--History and criticism.
Princeton subject headings:
Castrati--Italy--Biography.
Castrati--Italy--History.
Vocal music--Italy--History and criticism.