Loretta! ❤️ . “Coal Miner’s Daughter,” Her Signature Song In 1970, Lynn’s self-penned signature song, “Coal Miner’s Daughter,” became one of her biggest hits. She had made three albums of duets with Ernest Tubb before transitioning to recording duets with Conway Twitty. Her first song with Twitty, “After the Fire Is Gone,” topped the charts in 1971 and launched one of the most successful duet teams in country music history. Lynn and Twitty were the CMA’s Vocal Duo of the Year from 1972 through 1