Chris Willman Senior Music Writer and Chief Music Critic Jason Isbell has a new album out, “Weathervanes,” and he says, “I’m happy to be talking about it. You know, I’ve been talking about a lot of other stuff lately, and it’s nice to actually discuss the job that I chose for myself.” Nothing against the Other Stuff on his part, mind you. He’s proud of the much-heralded HBO Max documentary that director Sam Jones made about him, “Jason Isbell: Running With Our Eyes Closed,” even if it did open him and his wife, Amanda Shires, up to a huge amount amount of personal scrutiny. And he’ll sure be spending an even bigger part of the year than he is now talking about his dramatic role in Martin Scorsese’s “Killers of the Flower Moon,” which he now feels confident did not leave him in the position of “be(ing) the one guy that screws up this $200 million movie.”