Pigeonholing Blackberry Smoke has never been easy. Since emerging from Atlanta in the early ‘00s, the quintet has become known for a singular sound indebted to classic rock, blues, country and folk. Find A Light, the band’s sixth studio album, doubles down on diversity. Songs hew toward easygoing roots-rock and Southern stomps, as well as stripped-down acoustic numbers and bruising alt-country. Rich instrumental flourishes – keening fiddle, solemn organ and bar-band piano boogie – add further depth and resonance.