History of Rock and Roll - 1971

The History of Rock & Roll first aired on the weekend of February 21–23, 1969 on 93 KHJ Los Angeles, hosted by Robert W. Morgan. It aired for 48 hours and was later syndicated. Later that year, with slight modifications to the script, another version was aired hosted by Humble Harve Miller. The program was then taken to national syndication in the fall of 1969 by parent company RKO General. KHJ repeated this in 12-hour blocks. This version was syndicated throughout the early 1970s, and was sent to stations on large 101⁄2" reels of 1/4" tape, in full-track mono. - wikipedia

 In 1971 we apparently had the original KHJ version.  

History of Rock and Roll - 1971