I love Hayseed Dixie. I think it's fairly genius but I can see how they can get a bit tedious (totally unhelpful answer). Nah, they're good and it's hilarious but you have to be in the mood and take it in moderation. I have my love of Radio 2 to thank for getting me into this!
For more rockgrass-type stuff (slightly different from Hayseed Dixie)
http://uk.youtube.com/watch?v=epdmJwH-IdU
and... (one that I'm fond of and you may have heard at Rock Soc
http://uk.youtube.com/watch?v=GZGH5Q2SlXg[hr]
I may be a pretty sad case but I don't write jokes in base 13