I’ll have to disagree on this one, a headliner should be someone who can not only put on a great show but also is mainstream and has numbers. Someone like Billie, Imagine Dragons, Macklemore, David Guetta, Arctic Monkeys, Dua Lipa, Calvin Harris, Justin Bieber, etc. from the past two years alone are all people who I can bet if i come to anyone no matter their age will know them and recognize at least a couple of their songs which can’t be said about Fred again… and that’s obviously even more true about Stormzy who shouldn’t be headlining anything outside of the UK lol