I had a shrink who got pissed at the suggestion that one's taste in music had anyting to do with one's personality. And indeed -it probably doesnt.
But on the other hand - when people ask me what my favorite band is I usually reply " its a toss up between Led Zeppilin, and Earth, Wind, and FIre", which causes folks to look at me strange- as if that were an odd combination.
So maybe it does mean something.
Anyway- name some "folk metal" bands.
Actually Led Zep, Thin Lizzy, and Metallica, have all done metal versions of traditional folk and blues songs- like "Whiskey in Jar", "Gallows Pole", "When the Levi Breaks".