Some of these artists go back more than 25 years. Of these Nanci Grifith gets the most bonus points in my opinion. Bela Fleck and Chick Corea are two of the great musician/composers of the late 20th and early 21 centuries.
Bela Fleck
Nanci Griffith
Chick Corea
Sarah Jarosz
Tim O'Brien
Emmy Lou Harris
Keb Mo
Julian Lage
John Prine
John Hiatt