December 22, 2014 5:00 pm Michael Buble's 6 in the Mix Sing-off Roxanne Vargas and Michael Buble engage in a Holiday duet ahead of his Christmas special on NBC. US & World Videos 4:12 Keeping Up with Rock Legends on Tune Talk 3:41 Tune Talk: An Update about Madonna and More 8:28 Papa Keith Talks Hip Hop and Adam Duritz Discusses Upcoming Counting Crows Tour 4:13 The Pop Stars Making Waves This June 1:57 Gifts for Dad on Father's Day