Columbia subject headings:
Counterpoint.
Music--500-1400--Congresses.
Music--Italy--Friuli--500-1400--Congresses.
Harvard subject headings:
Music--500-1400--History and criticism--Congresses.
Music--Congresses
Music--Italy--500-1400--History and criticism--Congresses.
Music--Italy--Friuli--500-1400--History and criticism--Congresses.
Princeton subject headings:
Music--500-1400--History and criticism--Congresses.
Music--Italy--500-1400--History and criticism--Congresses.
Music--Italy--Friuli--500-1400--History and criticism--Congresses.