I've already triggered a top rating and a hate-this-from-the-bottom-of-my-soul rating, so I know you're not being biased in any direction
For the genre of
folk, I'd like to submit a track. Note that while the band usually does folk metal, this track is from an album where they've stripped the metal part of the equation out entirely (the second such album from this band, I believe).
Folk music is many things, and this is very, very far away from Joni Mitchell and Mellow Candle.
Eluveitie - Lvgvs
The band is Swiss and if I'm not mistaken, they're singing in Helvetian, which is close to, or the same as Gaulish.