The first music store chain in the United States , it was founded in 1937 in Pittsburgh , Pennsylvania , and operated more than 130 locations at its peak .
National Record Mart , known as NRM for short , was an American music store chain .
The first music store chain in the American   , it was founded in 1937 in Pittsburgh , Pennsylvania , and operated more than 130 locations at its peak .
National Record Mart , known as NRM for short , was an American music store chain .