Columbia subject headings:
Harvard subject headings:
Boys' choirs--Vatican City--History--20th century.
Cantors (Church music)--Italy--Rome--Catholic Church--Biography.
Cantors (Church music)--Vatican City--Catholic Church--Biography.
Cappella musicale Pontificia--History--20th century.
Choral conductors--Italy--Rome--Biography.
Choral conductors--Vatican City--Biography.
Church music--Vatican City--20th century--History and criticism.
Princeton subject headings:
Cappella musicale Pontificia--History--20th century.
Church music--Vatican City--20th century.