The Persistence of Prog Rock...
In the 1950s, rock 'n' roll was music to dance to, with upbeat 2- to 3-minute records that were easy for disc jockeys to schedule, whether on radio or at sock hops. The in the mid-1960s, the Beatles sought enlightenment...
https://www.neatorama.com/2017/06/16/The-Persistence-of-Prog-Rock/
