Author Colson Whitehead’s latest novel “The Underground Railroad” tells the story of a Georgia slave on a quest for her freedom by riding a train state-to-state. We talk with Colson Whitehead ahead of his appearance Wednesday night at the Carter Center in Atlanta. Plus, the state of Georgia has declared 2016 the Year of Georgia Music. Each month will be a celebration of people who make this state’s soundtrack come alive. In this installment, we talk about songwriting in Georgia. We speak with