Columbia subject headings:
African Americans--Music--History and criticism.
Music trade--United States.
Music--United States--20th century--History and criticism.
Harvard subject headings:
African Americans--Music--History and criticism
Music trade--United States
Popular music--United States--History and criticism
Princeton subject headings:
African Americans--Music--History and criticism.
Music trade--United States.
Music--United States--20th century--History and criticism.