Skip to main content Kahan stopped by Williams' multi-night stand at Nashville's Ryman Auditorium Valerie Terranova/Getty Images; Kevin Mazur/Getty Images for Spotify Fresh off the release of his new album The Great Divide, Noah Kahan stopped by Hayley Williams ‘ Nashville show to perform “Downfall.” Kahan appeared onstage during Williams’ second of three nights at the Ryman Auditorium, on her first-ever solo tour . “Thank you Hayley, you’re a legend,” Kahan said, before breaking into the Great Divide highlight. Williams joined Kahan for the chorus, harmonizing with him. Kahan co-produced and co-wrote “Downfall” with Aaron Dessner and Gabe Simon, while Bon Iver’s Justin Vernon contributed backing vocals.…