You've heard 99% of country music?
Anyways, I don't listen to a lot of it, and don't listen to much of the new stuff (seems like country is blending more with the pop that we're hearing these days...), but I do dig the outlaw country like Steve Earle and Johnny Cash.
To be honest it's just not a genre I go out of my way to explore but if someone gave me some music like the two I mentioned I'd gladly check it out.