Columbia subject headings:
Harvard subject headings:
Gregorian chants--History and criticism.
Music--500-1400--History and criticism
Psalmody.
Psalms (Music)--66th Psalm.
Responses (Liturgy)
Princeton subject headings:
Music--500-1400--History and criticism.
Psalmody.
Psalms (Music)--66th Psalm.
Responses (Liturgy)