The Gavin Report was a San Francisco-based trade publication. Founded by radio performer Bill Gavin in 1958, it served the radio industry until 2002.
Sometime in the 1970s, one issue of The Gavin Report included the narrated audio presentation, “The History Of Radio Jingles.” It has been posted at JingleSamplers.com:
http://jinglesamplers.com/gavinjinglehistory.htm
It runs just under 15 minutes.