'The Voice's Christina Aguilera, Adam Levine, Cee Lo Green and Blake Shelton rock House of Blues

11 of 14: 'The Voice' contestant Nicholas David ('Team Cee Lo') walks the red carpet before the NBC show's special concert to celebrate the announcement of the top 12, held at the House of Blues in Los Angeles on Nov. 8, 2012. ( Photo / Frazer Harrison / NBC)