Columbia subject headings:
Popular culture--United States--History--20th century.
Popular music--United States--History and criticism.
Sound recording industry--United States--History.
Harvard subject headings:
Popular culture--United States--History--20th century
Popular music--United States--History and criticism
Sound recording industry--United States--History.
Princeton subject headings:
Popular culture--United States--History--20th century.
Popular music--United States--History and criticism.
Sound recording industry--United States--History.