The Folk & Americana stations on Spotify for general listening, otherwise:
1. Van Morrison
2. Ray Lamontagne
3. New Basement Tapes
4. Justin Townes Earle
5. Punch Brothers
6. Dan Tyminski
and country in general also.
What really gets my kicks when relaxing is soundtracks, mostly those produced by Hans Zimmer, John Williams, Klaus Badelt, Thomas Newman, Danny Elfman...