Columbia subject headings:
Harvard subject headings:
Composition (Music)--History--20th century--Congresses.
Music--20th century--Philosophy and aesthetics--Congresses.
Music--20th century--Social aspects--Congresses.
Music--Europe--20th century--History and criticism--Congresses.
Music--Latin America--20th century--History and criticism--Congresses.
Princeton subject headings:
Composition (Music)--History--20th century.
Composition (Music)--Social aspects.
Music--20th century--Philosophy and aesthetics.