We think Swedish duo First Aid Kit are pretty fantastic, so what could possibly improve upon sisters Johanna and Klara Söderberg’s beautiful folk harmonies? Perhaps R.E.M’s Peter Buck on guitar. That’s exactly what happened when Buck joined First Aid Kit in a performance of their cover of R.E.M.’s ‘Walk Unafraid.’ Watch it above.

First Aid Kit recorded a cover of the R.E.M. song – which originally appeared on the band’s 1998 album, ‘Up’ – for the Reese Witherspoon-starring movie ‘Wild.’ When they went to film a video for the song, they invited Buck to the set. And now, we’re reaping the benefits of the three artists' collaboration in the new clip.

“It was pretty surreal,” Johanna told Billboard. “We filmed a take of us singing together out in the freezing cold – it was so kind of him and a super cool experience.”

And for a little context, check out R.E.M. performing 'Walk Unafraid' live in Germany in 2003 below:

What do you think of First Aid Kit's cover? Let us know in the comments section below!