Columbia subject headings:
Music trade--United States.
Music--Economic aspects--United States.
Popular music--Economic aspects--United States.
Harvard subject headings:
Music trade--United States
Music--Economic aspects--United States
Popular music--Economic aspects--United States.
Princeton subject headings:
Copyright--Music--United States.
Music trade--United States.
Popular music--Writing and publishing--United States.
Sound recording industry--United States.