Columbia subject headings:
Music and philosophy--History--To 1500--Congresses.
Music, Greek and Roman--Congresses.
Philosophy, Ancient--Congresses.
Harvard subject headings:
Music and philosophy--History--To 1500--Congresses.
Music, Greek and Roman--Congresses.
Music--Philosophy and aesthetics--Congresses
Philosophy, Ancient--Congresses.
Princeton subject headings:
Harmony of the spheres.
Music--To 500--Philosophy and aesthetics--Congresses.