As talking pictures emerged, with their prerecorded musical tracks, an increasing number of moviehouse orchestra musicians found themselves out of work. More than just their position as film accompanists was usurped; according to historian Preston J. Hubbard, "During the 1920s live musical performances at first-run theaters became an exceedingly important aspect of the American cinema." With the coming of the talkies, those featured performances—usually staged as preludes—were largely eliminated as well. The American Federation of Musicians took out newspaper advertisements protesting the replacement of live musicians with mechanical playing devices. One 1929 ad that appeared in the "Pittsburgh Press" features an image of a can labeled "Canned Music / Big Noise Brand / Guaranteed to Produce No Intellectual or Emotional Reaction Whatever" and reads in part: