Bill Haley, Chuck Berry, Connie Francis, Little Richard, The Platters were from the 50s rock and roll scene and not the 60s.
Elvis was the King but Alan Freed was the Father of Rock n Roll as he deemed himself to be. To him it was a "river of music that has absorbed many streams, rhythm and blues, jazz, ragtime, cowboy songs, country songs, folk songs. All have contributed to the big beat (Wikipedia)."
Watching the two movies by Alan Freed gave a simple idea of what rock and roll was all about. The movies were actually music videos that we find so rampant on TV today but with thin story lines that pieced the music appearances of the different groups together.