"Before Kasey Kasem debuted with his countdown in 1970.....was there a countdown show coast to coast or regionally back in the 60's which was based on a trade magazine"
I don't think so, because there wasn't one on the air in LA, and I'm sure one of the 4 of 5 Top 40 stations in the market at that time would have run such a show on the weekends, if it existed.
I can tell you that Casey was the fill-in and weekend guy on KRLA for a couple of years leading up to AT40 - and he did virtually the same countdown show with the same elements, except the number ratings were from the trade mag called "Cash Box," not Billboard. And of course, AT40 had the AT40 jingles and musical signatures, not KRLA jingles. Otherwise, the show was virtually the same. Perhaps Casey turned up the schmaltz a little for AT40 - KRLA was considered a hip station for the time, and had brought some FM album rock elements into their programming, so Casey was definitely the squarest DJ there.
>>>>I thought there was some type of countdown containing the Cashbox charts....but I didn't think Casey had anything to do with that. I guess that could've been experimental for the upcoming syndicate AT 40. I would love to hear those airchecks of those countdowns of the late 60's if they were available.
The interesting thing is why it took so long till 1970 to come up with a show like AT 40. Over 15 years went by as far as your favorite pop and rock hit records charted.
Programming genius Ron Jacobs (PD at KHJ, and later KGB) gets a lot of credit for AT40, and perhaps he deserves it for selling the show so successfully around the country. But the show's format was Casey's baby all the way.