I see. I was thinking there must have been a succession of terms for each era in country music, just as there is for popular music. For instance, to many people, "smokin' oldies" is the specific term for pre-Beatles oldies ('50s - '64), while everything from the Beatles until the dawn of classic rock is just plain "oldies."
I've never heard the term "smokin' oldies" except as, maybe, a liner on a 50's and 60's based station decades ago. It's not an industry term I recognize. I looked for it in a search of Billboard from the 60's to the end of the 90's and did not find anything indicating it was a recognized term in the industry of radio or that of music.
Classic rock, of course, was itself only applied to '70s rock, not '70s pop.
Classic rock is the "graduating class" of AOR in the last several decades. It may have included even some "flower power" late 60's, 70's, 80's and, more recently, 90's.
And '50s/'60s rock was just "rockin' oldies," or "oldies rock," or originally, "rock and roll."
Again you have come up with several terms I have never heard given to a style, era or kind of music format. "Rockin' oldies" sounds like a Saturday night specialty show with Buddy Holly and Little Richard songs. I have never heard "oldies rock" used at all.
And "rock and roll" or "rock 'n roll" or "rock 'n' roll" is what was sort of the generic term for the music Top 40 stations played for the decade between Rock Around the Clock and "I Want To Hold Your Hand".
And "classic hits," of course, somehow became the term for '80s and '90s oldies, that generation, like past ones, not wanting their oldies confused thematically with their parents'.
"Classic Hits" is the term "oldies" stations changed to for sales purposes when "oldies" became identified among agency buyers as meaning a format that appealed to mostly over-55 listeners. So stations playing 60's and 70's phased out the 60's, and then, over a number of years and at different rates depending on the market, began thinning the herd of early 70's. Now, we have "Classic Hits" meaning later 70's, a lot of 80's and a thin smattering of 90's in most cases.
As time goes on, stations in the Classic Hits format will want to slowly remove the 70's stuff and add more 90's as their target is primarily 35-54 and so each year, the add the "new" 35's and drop those who are now 55. It's totally dynamic, and based on a stable target age which is a moving target musically.
That was why I asked about "classic country." If there's no long list of variant subterms for the different eras of country music, then "classic country" essentially becomes a meaningless term, meaning a completely different subgenre/era of country music to each listener or collector.
In the case of radio, "classic country" is a positioning statement or term. No matter what the age range of the songs they do play, they call it "classic". There is no "format police".
If we look at "classic hits" vs. "oldies" we see that many true classic hits stations still continued for a decade or more to call themselves "oldies" because the term was positive to listeners. There is no format police to make stations use or not use names.
When Arrow 93 became JackFM!
And when "Jack" impacted American radio, Nielsen was petitioned to add a format name, "Adult Hits" to cover the wide range of decades and music types that a Jack or imitation Jack might play.