The country singer said she often impresses her band's guitar player Doyle Bramhall II with her melodic belch.
She told Pop Eater: 'Doyle just thinks it's fascinating that I can sing through a burp if that means anything to you. I can be on stage and, you know, I can sustain a burp until I'm done with a phrase. You know part of it is just doing it, part of it is singing, it's like any other sort of craft of muscle. The more you do it, hopefully, the better you get at it, the more you understand it and the better you are able to control.'