Columbia subject headings:
Music and literature--History--20th century.
Russian poetry--20th century--History and criticism.
Harvard subject headings:
Music and literature--History--20th century.
Music and literature.
Music in literature.
Russian poetry--20th century--History and criticism
Russian poetry--History and criticism--20th century.
Princeton subject headings:
Music and literature.
Music theory--History.
Russian poetry--20th century--History and criticism.