If you're unfamiliar with the music of Oklahoma-born, Nashville, Tenn.-based singer/songwriter JD McPherson, you're in for a treat. His blend of soul, rock, blues, and R&B feels as good as it sounds — and it sounds incredible. On his third album, Undivided Heart & Soul, McPherson adds a dash of experimentation, a layer of fuzz and plenty of his signature swagger with signature tracks such as "Crying's Just A Thing You Do" and "Lucky Penny." We sat down with the rock and roll scholar (and rebel) backstage at Newport Folk Festival to find out how both songs came to life.