To describe Alabama native Jason Isbell as a thoughtful, progressive country artist does a disservice to the genre, since he’s hardly alone in that regard, but the former Drive-By Trucker has become as much of a standard-bearer as Steve Earle or Johnny Cash. Granted, Isbell’s music has also been categorized as roots rock and Southern rock, but he seems less concerned with labels than those who bestow him with awards, like the Grammy he won for best Americana album in 2016.