It's fair to say that when Mumford & Sons first hit the limelight back in 2010, their rise was unexpected. They were a rousing folk band in the vein of acts like Old Crow Medicine Show, and they'd self-financed a debut album which was intriguing, courtesy of stirring ballads such as 'The Cave' and 'Little Lion Man'.

But headliner status in the States? Performing on national TV with Bob Dylan? Topping charts over in Australia and New Zealand? This was beyond their wildest dreams.

Everything since the release of their debut album, Sigh No More, has felt like Mumford & Sons trying to catch up with their runaway success. 2012's Babel leaned too heavily on the characteristics that made their first album so successful, while Wilder Mind leaned more towards electronic cues that tried to accommodate their place as arena headliners, but which didn't feel immediately natural for them.