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

<div class="meta "><span class="caption-text ">Clockwise from top left: &#39;The Voice&#39; coaches Cee Lo Green, Christina Aguilera, Adam Levine and Blake Shelton appear at the House of Blues in Los Angeles on Nov. 8, 2012 for the NBC show&#39;s special concert to celebrate the announcement of the top 12. (Frazer Harrison &#47; NBC)</span></div>
November 9, 2012 6:49:10 PM PST