There are only so many guys on the roster. Surely they must have a playlist with all music available at their fingertips the way we do on a computer or phone.
Yeah but I'm sure it's all queued up because they know who's supposed to win. The ending was fucked up in a lot of ways but I don't think Styles was supposed to win. Really, I think the biggest fuck up on that ending was how they shot it. They picked the absolute worst angle to show.