A Canadian disc jockey named Alan Cross has been doing these broadcasts for nearly 20 yrs. He looks at various aspects of rock n roll music, from it start to how different types evolved, to the equipment and how it changed music, to the weird and arcane looks. Always interesting.
https://en.wikipedia.org/wiki/The_Ongoing_History_of_New_Music#Stations
https://en.wikipedia.org/wiki/The_Ongoing_History_of_New_Music#Stations