This is quite striking to me. 1961/1962 is the start for me of a constant listening to the radio, every day, every week, waiting to hear the top 20 (or 30 or 40, depending on the station) and taking it all very seriously. By the time we hit CCR, I'm in college, and as much as I like the Jackson 5, was no longer listening to Top 40 radio by 1970.
"Just look over your shoulder!"