Columbia subject headings:
Civilization, Medieval.
Germany--Intellectual life.
Music--Germany--History and criticism.
Harvard subject headings:
Civilization, Medieval.
Germany--Church history--843-1517.
Germany--Civilization.
Hildegard, Saint, 1098-1179
Music--500-1400--History and criticism
Princeton subject headings:
Civilization, Medieval--Congresses.
Germany--Intellectual life--Congresses.
Music--Germany--History and criticism--Congresses.