With Special Guest Billy Strings After spending six years with Southern rock outfit Drive-By Truckers, singer/guitarist Jason Isbell left the group in 2007 to pursue a solo career. Isbell had already honed his songwriting skills during his tenure with the Truckers, and he funneled those talents into Sirens of the Ditch, a bluesy, punk-infused lesson in guitar tones and Southern swagger that marked his solo debut in summer 2007. While Isbell took a more introspective approach on his next two albums, 2009’s Jason Isbell and the 400 Unit and 2011’s Here We Rest,…