Radio & Records was first published in 1973. This audio was included as a cassette in their 15th Anniversary issue in 1988. Obviously, it preceded the WWW. Now it's available online and exclusively here. Here's an hour and a half of the best and most unusual US radio from 1973 to 1988, as judged by the premier radio trade for that period.
R&R 15th Anniversary, Side1
R&R 15th Anniversary, Side2