Well... I've been waiting an opportunity to speak in this forum. Since none has yet been presented I will speak anyhow.
Papa, "oldies" has a broad meaning to audiences. In reality, '70s and '80s are not "oldies". These decades are better referred to as "retro".
"Oldies" is best left to refer to music that was released when the Baby Boomers' parents were young and still partying. That's mid '60s and before. Pre-Beatles as it were.
I dunno about rock but I can definately share some suggestions for Country music. Remember, Country is the oldest form of American popular music. It existed long before Bill Haley and Elvis stole the style of artists that Motown picked up later.
American Country music has influenced everyone from ABBA to ZZ Top. Popular styles can be found in some of the old Bluegrass tunes that were written back in the 1930s. Gosh, look at Hank Williams, Jr. He's made a fortune on his Daddy's songs. He ain't alone.
My suggestion would be to get some Legion and VFW shows. Play what they like, get what you don't have and give the music some thought. These folks can be very loyal and they'll give you the best references.
I know you don't like Country. Neither did I at one time. But it's big and has a long history behind it. Besides, Country still has real musicians playing real instruments. And you can dance to it. How about that?
"There'll be times when you want to hold on but you've gotta let go." Kenny Chesney.