What is rock? -- Roots: part 2, the blues -- Roots: part 2, country and Western -- Roots: part 3, pre-rock pop -- Rhythm and blues -- Rhythm and blues people -- Doo-wop -- Rock and roll -- Rock and rollers -- Buildings and walls of sound -- Independent record labels and producers -- Rock and radio -- Motown -- Motown cavalcade -- Rock and roll onscreen in the 1950s.