Columbia subject headings:
Harvard subject headings:
Catholic Church--Liturgy--Texts--History and criticism.
Christian poetry, Latin (Medieval and modern)--History and criticism.
Gregorian chants--History and criticism.
Mass--History
Poetry, Medieval--History and criticism.
Religious poetry--History and criticism.
Princeton subject headings:
Hymns, Latin (Medieval and modern)--History and criticism.
Sequences (Music)--15th century--History and criticism.
Sequences (Music)--500-1400--History and criticism.
Tropes (Music)--15th century--History and criticism.
Tropes (Music)--500-1400--History and criticism.