I work with the music/entertainment industry and everyone so often someone comes along that just sticks in my head for a good reason.
If you are interested in listening to someone new to you and off the grid as far as being mainstream. Parker Millsap is in the country genre but with a definite old bluegrass/jazz feel to some of his stuff. He is my river sittin tunes...
https://www.youtube.com/watch?v=T3GYXO0XBSI
https://www.youtube.com/watch?v=xMYuIwVxIEA
Check him...out.