Columbia subject headings:
Harvard subject headings:
Catholic Church--Hymns--History and criticism.
Catholic Church--Hymns.
Cistercians.
Hymns, Latin--History and criticism.
Hymns, Latin.
Music--500-1400--History and criticism
Princeton subject headings:
Catholic Church--Hymns--History and criticism.
Catholic Church--Hymns.
Cistercians.
Hymns, Latin--History and criticism.
Hymns, Latin.
Hymns.
Music--500-1400--History and criticism.