Christian metalcore outfit August Burns Red loves Christmas so much that the band recorded an entire instrumental album of metalized carols and classics, 2012's August Burns Red Presents: Sleddin' Hill, A Holiday Album. But the group first got into the Yuletide spirit in 2007, recording a fan-favorite cover of "Carol of the Bells," which turned the already fairly metal-sounding tune into a shreddy epic. –BRANDON GEIST