Mumford and Sons will team up with singer-songwriter Emmylou Harris for a new episode of 'CMT Crossroads,' a show on the cable network that pairs together country artists with musicians from other genres for performances that often feature the stars covering each other's songs. The show is set to tape in front of an invitation-only audience in the Nashville area this week and will air Sept. 20 on CMT.

Expect Mumford and Sons, who issue their much-anticipated sophomore album, 'Babel,' on Sept. 24, to play songs both from that disc and their 2009 surprise breakout debut, ‘Sigh No More.' For her part, Harris will likely bring songs from her latest, last year's 'Hard Bargain' -- the highest-charting album of her long career -- as well as older hits and fan favorites.

Don't be surprised if the two artists team up to perform a song or two off  'All the Roadrunning,' the 2006 collaborative album Harris recorded with ex-Dire Straits frontman Mark Knopfler. They also will likely tell some great stories, chat with each other and even field some questions from the audience, which seems to be a common occurrence on 'Crossroads.'

Mumford and Sons are new to the 'Crossroads' scene, but Emmylou Harris was featured on an episode of with Dave Matthews that premiered in 2004. That show featured Matthews and Harris performing a version of 'Long Black Veil,' the country ballad originally recorded by Lefty Frizzell but since made popular by Bob Dylan, Johnny Cash and others.