Columbia subject headings:
Harvard subject headings:
Baptism--History--Middle Ages, 600-1500--Songs and music.
Gregorian chants.
Music--500-1400
Organa.
Water--Religious aspects--Christianity--Songs and music.
Princeton subject headings:
Baptism--History--Middle Ages, 600-1500--Songs and music.
Gregorian chants.
Music--500-1400.
Organa.
Water--Religious aspects--Christianity--Songs and music.