I agree about "Mercy Seat". (At the end, when he says: "But I'm
afraid I told a lie." and with the rising intensity of the Cash
version. Throughout the lyrics, the narrator keeps saying that he
told the truth, and at the end, he says he lied; and when you
imagine about being in the chair. It's chilling.)

I'd have to say that Lead Belly singing "Goodnight Irene" can be
kind of creepy. He sings "I'll GET you in my dreams" rather than
"I'll SEE you in my dreams" as many other singers would sing that
phrase.

It makes you wonder what he means by "Getting" her in his dreams.
Get her as a lover?
Get revenge on her? / Catch her?
Get her as in understand her, like "Oh, I getcha."?

Does anybody know why he says he'll "get" her?