A small crowd of about 100 people at one of Nashville's beloved dive bars was treated April 22 to an impromptu set by two folk-pop superstars: Ed Sheeran and Noah Kahan.

Stops have seen him appear with everyone from Megan Moroney and songwriter Amy Allen in Nashville, to Post Malone, Shaboozey and pop star Alex Warren at Coachella. Not content with that, he's also ...