Mumford & Sons disappointed fans when they were forced to cancel their headlining slot at Bonnaroo as a result of bassist Ted Dwane needing emergency surgery for a blood clot on his brain. But after a momentous fest-closing Glastonbury set – during which they were joined by members of Vampire Weekend, the Vaccines and more – the folkies are ready for a main-stage Lollapalooza throwdown. Don't be surprised, though, if frontman Marcus Mumford wears his emotions on his sleeve while crooning cuts off last year’s Grammy-winning Babel. "We're not like, hard men," admits multi-instrumentalist Winston Marshall. "We're emotional, weeping pussies."