I know of only scraps of his music but they booked him for a reason, either correctly or incorrectly. I say let him headline and make a fool of himself to justify all of this and more criticism, or let him play a monstrous hit-laden set and entertain millions of people, all the while giving the festival a bit of diversity. You don't have to watch it either way.
Always try and make it into a win-win.
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