In fact — if you want to try a collaborative effort on, say, Wayfaring Stranger sometime, let me know — bet between us we could come up with something definitive.

I would argue, though, that the Dylan melody is so different from the Cat Power setting that either the Cat is misfiled, or there are actually four categories (or three, but the last is split into two significant subcategories) — there are a bunch of settings in the same/like tune as Dylans which I’ve heard, and Cat Power’s tune echoes something I’ve heard come up once or twice in my memory, though I can’t place it now.