I've heard of Biffy Clyro from a friend, definitely thought saying they were a headliner was a typo haha. I guess they're much much bigger in the UK. Festival is looking nice this year. This is BMTH's year.
I am buying a ticket solely for this announcement. No doubt Paramore will get announced sometime soon and theres still the third headliner to come, so I know for sure I won't regret it. Only thing that would make this perfect is if The Wonder Years were announced for it too.