Columbia subject headings:
Boys' choirs--Italy--History.
Cathedrals--Italy--History.
Choirboys--Training of--Italy--History.
Choral singing--Instruction and study--Juvenile--Italy--History.
Church music--Catholic Church.
Eugene IV, Pope, 1383-1447.
Gregorian chants--Instruction and study--Italy--History.
Singing schools--Italy--History.
Harvard subject headings:
Boys' choirs--Italy--History.
Choirboys--Training of--Italy--History.
Church music--Italy.
Singing schools--Italy--History.
Princeton subject headings:
Boys' choirs--Italy--History.
Cathedrals--Italy--History.
Choirboys--Training of--Italy--History.
Choral singing--Instruction and study--Juvenile--Italy--History.
Church music--Catholic Church.
Eugene IV, Pope, 1383-1447.
Gregorian chants--Instruction and study--Italy--History.
Singing schools--Italy--History.