eTown’s latest episode featured Greensky Bluegrass and singer/songwriter Israel Nash. As with every episode of eTown, the two guest artists team up with the eTown house band and hosts Nick and Helen Forster for a finale collaboration.

As you can see from the “behind the scenes” footage at the beginning of the clip, Nick Forster was the mastermind behind the collaborative piece. Just a couple of hours before the show, Greensky Bluegrass and Israel Nash learned a tune that neither of them would include in their concerts—Katy Perry’s “I Kissed a Girl.”

While both Israel Nash and Greensky Bluegrass were skeptical of the selection, they pulled it off.

Thanks to eTown for the footage!