Pigeonholing Blackberry Smoke has never been easy.  Since emerging from Atlanta in the early ‘00s, the quintet – vocalist/lead guitarist Charlie Starr, guitarist/vocalist Paul Jackson, bassist/vocalist Richard Turner, drummer Brit Turner and keyboardist Brandon Still – has become known for a singular sound indebted to classic rock, blues, country and folk. Find A Light, Blackberry Smoke’s sixth studio album, doubles down on diversity.  Songs hew toward easygoing roots-rock (“Run Away From It All”) and Southern rock stomps (“The Crooked Kind”), as well as stripped-down acoustic numbers (“I’ve Got This Song”) and bruising alt-country (“Nobody Gives A Damn”).  Rich instrumental flourishes – keening fiddle, solemn organ and bar-band piano boogie – add further depth and resonance.