That thread about Beato and Rock is dead got me to thinking. You know maybe rock is just a sub variety of country. Like my parents, boomers and all they liked rock, but the only vaguely prog rock record they owned was Dark Side of the moon. They owned a whole lot of Dylan and Neil Young... See where I'm going with this? If you sit down and think about, Oh yeah even Nirvana did unplugged, and Greatful Dead did blue grass.
I mean is it a coincidence that white flight from the cities corresponded with the rise of Rock? EG as people moved out from the cities, they started to incorporate more rural elements into their music. Memorial day, my city has music festival, this year they did it at a park, rather than in the town center. I would have to say the acoustics of ponds, grass and trees is amazing.
I know people like to cite the negro influence, but even ragtime was a rural honkey tonk.