This one's for the iTunes users only, apparently, as a four-track EP created by Mumford & Sons and Laura Marling goes up for download this week. There were a few teething problems on the planned launch date, but Mumford & Sons say everything's in place now and working just fine.Actually, iTunes might be the only place to buy the EP, but it's not the only place you can hear it - all four tracks are currently available on Spotify, so you can get a preview before deciding whether or not to splash out on a digital copy of your own.

