Awesome thread. I've always been into hip-hop, but it wasn't until recently have I gotten into country. I started with O'Death.
I've taken some of your suggestions on here, but any more in this genre?
As for hip-hop, it's another genre that's rapidly evolving. I see no one has mentioned Immortal Technique.
If you have,
If you haven't:
Cause of Death
And here's another O'Death:
Down to Rest