Columbia subject headings:
Art and music--History--20th century.
Avant-garde (Aesthetics)
Avant-garde (Music)--United States--History--20th century.
Cage, John--Criticism and interpretation.
Harvard subject headings:
Art and music--History--20th century.
Avant-garde (Aesthetics)
Avant-garde (Music)--United States--History--20th century.
Cage, John--Criticism and interpretation.
Princeton subject headings: