...of Myra Hess. When the playing of the late Myra Hess in one of her famous wartime performances returned to the National Gallery last November thanks to the wonders of a piano roll, it was undeniably a concert with a difference. Christopher Cook tells the story of the multi-million pound player-piano industry with the help of enthusiasts and performers, and discovers how these remarkable instruments found their way from the bars and brothels of America to the homes of British high society.