This week, Nashville super-producer Dave Cobb, whose work with some of the true artists in modern country music—Sturgill Simpson, Chris Stapleton, Brandi Carlile, Jason Isbell—has earned him nine Grammys, talks about “Time of the Preacher.” It’s the overture/aria to Willie’s classic Red Headed Stranger, an album that Dave calls a beautiful, barren landscape, and it gets him thinking about Pink Floyd, the real definition of “outlaw,” and the most important instrument an artist can take into the studio: A belief in themselves.