“Vampire Goth Bluegrass”
Try this:
http://findarticles.com/p/articles/mi_hb5087/is_199901/ai_n18474244
I hadn’t heard of this group, but we listened to a Matisyahu record once, until Anoreth threatened to jump out the window while the car was moving ... and she was driving :-).
Vampire Goth Bluegrass is not an official genre (that I know of) but it’s only a small step from your traditional murder-and-haunting mountain ballads. Vassar Clements did a song that can be summarized as, “I hooked up with a bad, weird woman, and, well, you know, it was ... SHOOT, man! Now I’ll play the fiddle!” (He’s dead, though.)