Columbia subject headings:
Counterpoint--History.
Music theory--History.
Singing--History--500-1400.
Vocal music--History and criticism.
Harvard subject headings:
Counterpoint--History.
Music theory--History.
Singing--History--500-1400.
Vocal music--History and criticism.
Princeton subject headings:
Counterpoint--History.
Music theory--History.
Singing--History--500-1400.
Vocal music--History and criticism.