Kenny Chesney sits down exclusively with ET’s Cassie DiLaura as he reflects on his country music career. His book, ‘Heart Life Music,’ is out Nov. 4. Kenny reveals that his book forced him to slow down and look back on the whirlwind of his life and career, calling it ‘therapeutic.’ The superstar also opens up about mentoring the next wave of country stars, praising Kelsea Ballerini and Megan Moroney for their passion.