Columbia subject headings:
Music--Germany--Cologne--500-1400--History and criticism--Congresses.
Music--Germany--Mainz (Rhineland-Palatinate)--500-1400--History and criticism--Congresses.
Music--Germany--Rhineland--500-1400--History and criticism--Congresses.
Harvard subject headings:
Music--Germany--Cologne--500-1400--History and criticism.
Music--Germany--Mainz (Rhineland-Palatinate)--500-1400--History and criticism.
Princeton subject headings:
Cologne (Germany)--Intellectual life--Congresses.
Cologne (Germany)--Songs and music--Congresses.
Mainz (Rhineland-Palatinate, Germany)--Intellectual life--Congresses.
Mainz (Rhineland-Palatinate, Germany)--Songs and music--Congresses.
Music--500-1400--History and criticism--Congresses.
Music--Germany--Cologne--History and criticism--Congresses.
Music--Germany--Mainz (Rhineland-Palatinate)--History and criticism--Congresses.