A Christian pop group fronted by the brothers Joel and Luke Smallbone, For King & Country place the drums of the holiday chestnut front and center, with multiple percussionists pounding out a rhythmic beat. It’s a transfixing performance that mixes Imagine Dragons flair with Christmastime reverence, as Joel and Luke harmonize on the verses and flail away during the instrumental breaks, earning the band a standing ovation from the Nashville audience.