Dolly Parton’s father grew up poor and never got the chance to learn to read. Inspired by her family, over the past three decades, the 78-year-old country music legend has made it her mission to improve literacy through her Imagination Library book giveaway program. And in recent months, it has expanded statewide in places like Missouri and Kentucky. They are among 21 states where all children under the age of 5 can enroll to have books mailed to their homes monthly. On Tuesday, she stopped in both states to promote the program, even singing her favorite song, “Coat of Many Colors.”