Columbia subject headings:
Church music--Catholic Church.
Church music--Germany.
Premonstratensians--Liturgy.
Harvard subject headings:
Antiphons (Music)--History and criticism.
Church music--Catholic Church--500-1400.
Church music--Germany.
Premonstratensians--Liturgy.
Princeton subject headings:
Church music--Catholic Church--500-1400.
Church music--Germany.
Premonstratensians--Liturgy.