Morgan Wallen is the biggest, most controversial country star in America – now he’s headlining BST

Wallen’s country songs about ice cold beers, Southern charm, and lovesick regrets routinely top the US charts. His inoffensive subjects, however, belie a career marked, or perhaps buoyed, by a string of controversies. As he prepares to make his BST debut, Annabel Nugent chronicles his ascent