In the late 1970s, when people started accusing Dolly Parton of ditching her roots, her response proved all the reasons why she became a country legend in the first place. “I’m not leaving country,” she said. “I’m taking country with me.” At the time, Parton’s embrace of a more pop-leaning and melodically accessible style made others feel concerned about whether she was losing her authenticity. In their mind, most musicians only ever take the p…