Columbia subject headings:
Harvard subject headings:
Music theory--History--20th century--Congresses.
Music--20th century--History and criticism--Congresses.
Music--20th century--Philosophy and aesthetics--Congresses.
Princeton subject headings:
Music theory--History--20th century--Congresses.
Music--20th century--History and criticism--Congresses.
Music--20th century--Philosophy and aesthetics--Congresses.