While full of Southern grit, singer and guitarist Jason Isbell's songs also show off an introspective side and a gift for nuanced storytelling that make him one of the most successful and respected figures in the alt-country and singer/songwriter communities. After six years with the Southern rock outfit the Drive-By Truckers, Isbell left the group in 2007 to pursue a solo career. His early solo efforts, such as 2007's bluesy, punk-infused Sirens of the Ditch, boasted a raw, rootsy flavor filled with swagger. After coming to terms with a dependence on alcohol and drugs, Isbell...