The singer and guitarist, who just dropped an Allmans-inspired new album, swats away the trolls who come at him and his wife, Briley King When Marcus King dropped Darling Blue last September, he viewed the album as a personal retrospective. It was a record about growth, sobriety, and keeping demons at bay. King told Rolling Stone about choosing an even-keeled lifestyle , and the South Carolina native had a handful of tunes that reflected the impact of that decision. At first, those songs landed on the cutting room floor, but King couldn’t let them go. Now, he’s released them on No Room for Blue , a companion album that drops on Friday. King and his band began recording Darling Blue in Macon, Georgia, at the venerable Capricorn Studios — often cited as the birthplace of Southern rock — before finishing the project at Blackbird Studios in Nashville. Working with producer Eddie Spear (Zach Bryan, Brandi Carlile), King ended up with enough tracks to span two albums.…