1970's Top 40 AM radio

As you can tell from my recent reviews of CD's by Al green and The Bo-Keys, I have an affinity for 70's soul/R&B music. How did a redneck growing up in the oilpatch of west Texas develop this affinity? Shouldn't I have been listening to Conway Twitty and Glen Campbell? The answer is Top 40 AM radio. I remember listening to KRIG radio and hearing all sorts of "Top 40" music at the time. Back in the day, you could hear all sorts of music on a Top 40 station. Sample playlist, circa 1975:

Love Will Keep Us Together, Captain & Tennille
Rhinestone Cowboy, Glen Campbell
Shining Star, Earth, Wind & Fire
Kung Fu Fighting, Carl Douglas
Thank God I'm A Country Boy, John Denver
Laughter In The Rain, Neil Sedaka
Pick Up The Pieces, Average White Band
The Hustle, Van McCoy
Boogie On Reggae Woman, Stevie Wonder
Fire, Ohio Players
Magic, Pilot
Mandy, Barry Manilow

All these could be heard on the same station within a two hour timespan. Although I don't listen to all the above music anymore, I was exposed to it. Top 40 these days is much different and AM radio is pretty much for talk now, so a lot has changed. I'm not saying that's good or bad, just different.