Another folk/americana fan here, and I get contemporary pop music ads between my tracks on Spotify, and there's nothing more annoying than autotuned screeching between my Bob Dylan and Gillian Welch.

However instead of buying premium, I just use Spotify for discovery. If I like something I just get the album off iTunes, Amazon or Bandcamp. I find myself spending less per year than if I had subscribed to Spotify, _and_ I get to keep my music.