Columbia subject headings:
Music printing.
Publishers and publishing--United States.
Radio broadcasting--United States.
Sound recording industry--United States.
Television broadcasting--United States.
Harvard subject headings:
Legislative hearings.
Music printing.
Publishers and publishing--United States.
Radio broadcasting--United States
Television broadcasting--United States
Princeton subject headings:
Music printing.
Publishers and publishing--United States.
Radio broadcasting--United States.
Television broadcasting--United States.