John Mayer LOVES Katy’s single “Roar”!!!!

It’s # 1 on iTunes around the world, but what does John Mayer think of Katy Perry’s new single, Roar?

“I remember hearing it, going like, ‘Wow what an interesting experience’ to hear something that you identify as massive before it’s massive,” he tells Billboard. “I thought it was a really sweet, unforgettable sort of experience to hear someone’s work while they still have a very nascent relationship with it.”

“In a way you get swallowed up by it, it’s so big,” he says, adding: “Because it’s such an incredibly big song that it doesn’t need you to tell anybody, while you’re eating lunch, [that] millions of people are going to be dancing on tables to that.”