'I Will Wait' hitmakers Mumford & Sons have revealed that they're starting to get nervous ahead of their upcoming performance at the 2013 Glastonbury Festival.

The event, which will see the band play a headlining slot on June 30, takes place later this summer and will also see live sets from the likes of the Rolling Stones and Arctic Monkeys. Speaking about the 'pressure' to be perfect at the festival, frontman Marcus Mumford told Absolute Radio:

"Glastonbury is this big old juggernaut and its legacy is huge. We're playing the night after the Stones and of course it comes with a different kind of pressure. One that we're up for I think, otherwise we wouldn't have said yes. It's such a big deal for any English band, it is just kind of the biggest deal."

The band will also perform on July 6 at London's Queen Elizabeth Park and added that they're so glad to be home after breaking the U.S. market: "It's funny being a musician, because if you're not doing gigs then you're generally sitting at home and none of us are really sit at home kind of people, so we're quite enjoying busying ourselves this summer."

"We wanted to focus on England a bit more, we'd been in America a lot the last year or two. The summer's all about the UK, so we're really excited."

Watch the band perform a live radio session here: