Columbia subject headings:
Composition (Music)--20th century.
Music and language.
Music--20th century--History and criticism.
Harvard subject headings:
Avant-garde (Music)
Composition (Music)--20th century.
Composition (Music)--History--20th century.
Music and language.
Music--20th century
Music--20th century--History and criticism
Princeton subject headings:
Composition (Music)--20th century.
Music and language.
Music--20th century--History and criticism.