Columbia subject headings:
Music and literature.
Poetry--History and criticism.
Vocal music--15th century--History and criticism.
Vocal music--500-1400--History and criticism.
Harvard subject headings:
Music and literature.
Music--15th century--History and criticism--Congresses.
Music--500-1400--History and criticism--Congresses.
Poetry--History and criticism
Vocal music--15th century--History and criticism.
Vocal music--500-1400--History and criticism.
Princeton subject headings:
Music and literature.
Music--15th century--History and criticism.
Music--500-1400--History and criticism.
Music--Congresses.