Alice Cooper has claimed that labeling Mumford And Sons a rock back would be an "offense to rock 'n' roll." According to NME, The rock singer explained that modern musicians were "afraid to be in a rock band" and said that the current generation needs to "quit eating vegetarian food" and "eat a steak" instead.

Cooper added, "Rock 'n' roll is not about 'Happy happy happy, everything's okay. We're The Lumineers, let's clog dance.' Hey, there's a place for that. If I wanted to see a great clog dancing band, I'd see The Lumineers."

Cooper also revealed that although Mumford And Sons are great at what they do, they are not rock 'n' roll. He said, "I get they want to be folk rock, and I guess they want to look like everybody else. I'm old school when it comes to if you're in a band, you're an outlaw. You don't play by those rules, you're a rock 'n' roll outlaw. It doesn't mean you have to be on drugs, but when you get onstage you don't play the guitar up here, and it's not an acoustic guitar. You play the guitar down here. It doesn't come from your brain, it comes from your guts. It comes from your groin. It's sexual. It's tribal."
He added, "Finally, I just went 'Okay -- you guys don't want to be rock bands, great. That's better for us.' There's more for Foo Fighters, there's more for Green Day, more for the bands that really are rock bands. I don't understand why everybody is so afraid to be in a rock band."