What good is dancing, fashion, or videos to a blind person? They can only judge the music that they can hear. People don't go to a jazz concert or to a symphony orchestra to see dancing. When people buy a record, they don't see dancing or a pyro show either. Out of all the acts since the recording industry began, a very small percentage danced or did steps. If dancing is the main draw, how did any of those non-dancing acts become popular? Music is the primary draw, the rest is secondary. Not everyone goes to concerts, they might only listen to the radio. Before MTV and cable TV, most popular acts were not seen on TV much. There were only 3 major networks in the USA plus PBS and a few local channels on UHF. Maybe you could see an act occasionally on programs like American Bandstand, Soul Train, Shindig, Midnight Special, Ed Sullivan, etc. Those shows came once a week, and lasted 30 minutes or an hour. Really less than that with the commercials. So the radio is the main place the general audience heard music or maybe a jukebox at a club/bar. People who went to concerts most likely already liked a performer's music that they heard, not saw. Music videos were irrelevant pre-1980s, although some were made. They weren't really shown on TV. A few were shown in clubs or sent to foreign countries because this was cheaper than flying an act to different places just to do a TV show.
