The Sing-Off 'The Sing-Off' crowns Pentatonix its third-season champions 11/29/2011 The Sing-Off crowned Pentatonix its winning group during Monday night's live NBC finale broadcast of the a cappella singing competition's third season. Read More RELATED NEWS Kirstin Maldonado: I love how Pentatonix inspires young singers'A Pentatonix Christmas Special' featuring Reba McEntire and Kelly Clarkson to air on NBCNick Lachey and Vanessa Lachey welcome baby No. 2 into their family TAGS: The Sing-Off Sara Bareilles Smokey Robinson Ben Folds Nick Lachey Flo Rida Shawn Stockman Kevin Olusola Kirstin Maldonado The Sing-Off
