In August 1964, twenty-one-year-old photographer Douglas R. Gilbert, on assignment for Look magazine, photographed an up-and-coming folk singer named Bob Dylan. Just twenty-three years old, Dylan had already composed a striking body of work, including "Blowin' in the Wind," yet he himself was still relatively unknown. All that was about to change. For more than a week, Gilbert photographed a surprisingly open Bob Dylan, smiling and relaxed among friends...