Columbia subject headings:
Music--Social aspects--United States--History.
Music--United States--20th century--History and criticism.
Music--United States--20th century--Miscellanea.
Popular music--United States--History and criticism.
Popular music--United States--Miscellanea.
Harvard subject headings:
Folk music--United States--History and criticism
Music--United States--20th century--History and criticism
Popular music--United States--History and criticism
Princeton subject headings:
Folk music--United States--History and criticism.
Music--United States--20th century--History and criticism.
Popular music--United States--History and criticism.