thats-the-way-it-was:

August 5, 1957: American Bandstand, a local Philadelphia tv program featuring popular dances and songs of the time, debuts nationally on ABC Television. The show ran on the network for the next 20 years and then syndication for the next two ending in 1989.

Photo: Teenagers dancing on set at American Bandstand, Philadelphia 1957 (Hulton Archive / Getty)