Columbia subject headings:
Antiphons (Music)--History and criticism.
Catholic Church--Liturgy.
Paschal triduum--Music.
Harvard subject headings:
Antiphons (Music)--500-1400--History and criticism.
Antiphons (Music)--History and criticism.
Catholic Church--Liturgy.
Church music--Catholic Church--500-1400.
Easter music--History and criticism.
Gregorian chants--History and criticism.
Holy Week music--History and criticism.
Princeton subject headings:
Antiphons (Music)--History and criticism.
Catholic Church--Liturgy.
Paschal triduum--Music.