Tributes have poured in for Dolly Parton, the pioneering country music singer, songwriter and actor, who has died aged 80. Stars including Taylor Swift, Beyoncé, Oprah Winfrey and Paul McCartney have paid tribute to one of the world’s greatest music artists, with many praising her lifelong philanthropy and advocacy for literacy and LGBTQ+ rights. Lucy Hough speaks to Guardian deputy features editor Jenny Stevens