Columbia subject headings:
Gregorian chants--Congresses.
Liturgical dramas--Congresses.
Nicholas, Saint, Bishop of Myra--Art--Congresses.
Nicholas, Saint, Bishop of Myra--Drama--Congresses.
Nicholas, Saint, Bishop of Myra--Songs and music--Congresses.
Harvard subject headings:
Gregorian chants--History and criticism.
Liturgical drama--Italy--500-1400.
Music--Italy--Bari--500-1400--History and criticism.
Nicholas, Saint, Bp. of Myra--Art.
Nicholas, Saint, Bp. of Myra--Cult.
Sequences (Music)
Princeton subject headings: