Mumford and Sons are nervous about their first area headline shows in the UK, because bigger venues make it harder for them to get their sound across.
Mumford and Sons are nervous about headlining arenas.
The band have just released their second album 'Babel' and announced a huge run of shows - including their first ever arenas in the UK - and are worried about making their sound big enough to fill such huge spaces.
Band member Winston Marshall told radio station XFM: ''We've only ever done five [arenas] I think.
''We did three in Canada, one in Portland, Oregon and one in Amsterdam and it was quite difficult.
''Big respect to bands who do arenas because, it's a big space to fill.''
Band mate Ben Lovett added: ''It's hard to connect but it's also kind of epic and a part of us always wanted to achieve those things.''
The band - which also includes Marcus Mumford and Ted Dwayne - have also recently talked about their focus on performing live, and how their recorded albums are designed to urge people to come and see them perform.
Ben added: ''We want our second album to be an advert for our live shows.
''That's why it's more of a mixture than the first record. I'll tour until I'm dead as that's where we are most at home, and I hope that comes across in 'Babel'.''
Take a look back at October's inaugural event.
The film is expected to continue without Mendes' involvement.