Flashback: See Dolly Parton and Barbara Mandrell's Campy Beatles Cover

As two of the most influential female artists of the late Seventies, Dolly Parton and Barbara Mandrell both broke new ground in — and outside of — country music. While Parton made the successful crossover to pop music and starred with Jane Fonda and Lily Tomlin in the blockbuster 1980 film 9 to 5, Mandrell joined her sisters Louise and Irlene in an NBC variety series that debuted in the fall of that year and spotlighted the siblings' virtuosity on numerous musical instruments, adding