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

Slideshow posted in Photos | Friday, November 09, 2012

3 of 14: 'The Voice' coaches Christina Aguilera and Adam Levine perform at 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)