Columbia subject headings:
Avant-garde (Music)--Germany.
Avant-garde (Music)--United States.
Music--Germany--20th century--History and criticism.
Music--United States--20th century--History and criticism.
Harvard subject headings:
Avant-garde (Music)--Germany.
Avant-garde (Music)--United States.
Music--Germany--20th century--History and criticism
Music--United States--20th century--History and criticism
Princeton subject headings:
Avant-garde (Music)--Germany.
Avant-garde (Music)--United States.
Music--Germany--20th century--History and criticism.
Music--United States--20th century--History and criticism.