Reminds me of the scene in the Blues Brothers film when the lady at the club was asked what type of music did they feature replied "both types Country and Western".
Personally on the whole I detest the so-called country music that currently comes out of Nashville and has done for years, nothing more than pop music. But much of the early recorded country music was derived from much older music in the public domain and included variations of old British ballads. But you already know that don't you.

Despite the warning above by Rafflebear I wouldn't think that John Prine songs come under the label of Country and Western.

From my limited experience of folk clubs these days it seems like almost anything goes particularly when "floor singers" are involved.

Hoot