Glastonbury headliner Shania Twain says her voice changed forever after 'devastating' diagnosis
![Glastonbury headliner Shania Twain says her voice changed forever after 'devastating' diagnosis](https://i2-prod.mirror.co.uk/incoming/article33138717.ece/ALTERNATES/s615/3_Shania.jpg)
Shania Twain wowed crowds with her Glastonbury set in 2017, but she once feared she would never be able to sing again after contracting a disease that forced her to undergo open-throat surgery