Emmylou Harris—who was presented with a Pioneer Award at the Academy of Country Music's ACM Honors in Nashville Tuesday night—joins English folk rock quartet Mumford & Sons on stage for a new episode of CMT Crossroads, premiering tonight on CMT at 9 PM ET.

CMT Crossroads shows the far-reaching roots of country music by pairing country artists with musicians from other genres. The show features the artists performing together, swapping stories and sharing their common love of music. Tonight's episode was recorded earlier this month in Nashville before an invitation-only audience. It marks Mumford & Sons' first appearance on CMT Crossroads. Harris previously shared the bill with Dave Matthews for a CMT Crossroads episode that premiered in 2004. Watch a preview of the episode below.

In an article in the Associated Press examining the partnership featured on the show, Marcus Mumford credits Harris with helping him and his band mates develop an appreciation for American roots music.

"Pretty much every song that Emmylou has sung on is my favorite song of whichever artist she sang with," Mumford tells the AP. "I'm like an obsessive Emmylou Harris freak and I'm not ashamed."

Harris has kind words of her own for the band and the opportunity to sing with them on CMT Crossroads.

"They're great harmony (singers) and they've got this great driving groove with a minimalist instrumentation," says Harris. "But they just sound good and the songs have beautiful melodies and I love harmonizing on them."

Read the complete AP article in the Washington Post at washingtonpost.com. And watch an excerpt from the AP interview and scenes from tonight's show here: