This last official episode of this season of The Sing-Off aired on Monday night with The Sing-Off Xmas special bringing good tidings of a cappella joy. The big draw for me to tune in was to see a supergroup comprised of last season's winners Committed and this season's favorites Afro-Blue. The two sets of vocal powerhouses joined forces to sing a soulfully sweet rendition of "Ooh Child" by The Five Stairsteps. I don't recall this song being on any Christmas music playlist I've ever made, but as good as these two groups sounded together it was definitely a gift.