The following description comes from the event organizer.

The Grammy-winning Mark and Maggie O’Connor bring their dynamic energy to a wondrous mixture of bluegrass instrumental and vocal music with An Appalachian Christmas. The holiday tradition features fresh arrangements of Christmas classics and captures the emotions of the season: playfulness, joy, contemplation, gratitude and more. Performing on fiddle, acoustic guitar, mandolin and vocals, the husband and wife duo brings an elegance and earnestness to down-home bluegrass, Americana and folk music. 

The O’Connors engaged in a rousing, flirty, high-energy back and forth (she in jazzy riffs and he in a more bluesy vein)...Great fun!
— WTTW Chicago