“I was having nightmares every night, thinking, ‘Wow, they’re going to hate this,” says JD McPherson. When he talks about his 2017 album, Undivided Heart & Soul, there’s no glimmer of self-adulation, or even the confidence one might expect of a veteran artist. Instead, there’s a snapshot of McPherson’s creative process bringing the record to life, a journey filled with fear and change, then boldness, and, eventually, catharsis.