Columbia subject headings:
Cage, John--Criticism and interpretation--Congresses.
Music--20th century--Congresses.
Harvard subject headings:
Cage, John--Criticism and interpretation--Congresses.
Music--20th century--Congresses
Princeton subject headings:
Avant-garde (Music)--Congresses.
Cage, John--Criticism and interpretation--Congresses.
Music--20th century--History and criticism--Congresses.