Mumford & Sons’ singer Marcus Mumford has revealed how horrified he was at the reaction to Arcade Fire’s performance during this year’s Grammys.

“I was pissed off when everyone was walking out because they’re the best live band in the world,” he tells the new issue of ‘Rolling Stone.’ “We were like, ‘Why are you all leaving? Why are you just trying to talk to famous people? This is Arcade Fire!’”

Mumford also said that sharing the stage that night with Bob Dylan was “surreal,” adding, “You can imagine the reaction of someone who wouldn’t be  playing music at all if it wasn’t for Dylan.”

Watch Mumford & Sons performing with Bob Dylan and the Avett Brothers at the Grammys here: