Parton and Cyrus' 2017 duet was deemed inappropriate for first graders to sing at a school concert -- but it's not clear exactly what part of the song raised the red flag.
Parton had already been a country star for a number of years by the time she released her 16th studio album, but the crossover success of the album launched the second phase of her career, in pop music, and earned the superstar her first gold album.