MarioMania said:
In the 1960s, "....before corporate programmers dictated what to play and when to play it..." -- BOGUS. Corporate programmers were programming radio stations prior to the 1970s. There was Bill Drake with KYNO, KSTN, and KDB, and then with KHJ, KFRC, and the other RKO stations. But even before that was Chuck Blore with KFWB, KEWB, and KDWB, going back to -- are you ready! 1959. DJs weren't free to play what they wanted. The success of Top 40 was based on corporate programmers dictating what to play and when to play it.