A Jason Isbell record always lands like a decoder ring in the ears and hearts of his audience, a soundtrack to his world and magically to theirs, too. “Weathervanes” carries the same revelatory power. This is a storyteller at the peak of his craft, observing his fellow wanderers, looking inside and trying to understand, reducing a universe to four minutes. “Weathervanes” is a collection of grown-up songs: Songs about adult love, about change, about the danger of nostalgia and the interrogation of myths, about cruelty and regret and redemption. Life and death songs played for and by grown ass people. Some will make you cry alone in your car and others will make you sing along with thousands of strangers in a big summer pavilion, united in the great miracle of being alive. The record features the rolling thunder of Isbell’s fearsome 400 Unit, who’ve earned a place in the rock ‘n’ roll cosmos alongside the greatest backing ensembles, as powerful and essential to the storytelling as The E Street Band or the Wailers. They make a big noise, as Isbell puts it, and he feels so comfortable letting them be a main prism through which much of the world hears his art. He can be private but with them behind him he transforms, and there is a version of himself that can only exist in their presence. On stage with the 400 Unit, he can be a guitar hero when he wants, and a conductor when he wants, and a smiling fan of the majesty of his bandmates when he wants to hang back and listen to the sound.