This June 2012 photo released by NBC shows mentors, from left, Blake Shelton, Christina Aguilera, Cee Lo Green and Adam Levine on the set of "The Voice," in Los Angeles. The contest between "The Voice" and "The X Factor" is escalating after NBC scheduled its "Voice" against Wednesday's second-season debut of Fox's "X Factor." (AP Photo/NBC, Tyler Golden)

Associated Press
This June 2012 photo released by NBC shows mentors, from left, Blake Shelton, Christina Aguilera, Cee Lo Green and Adam Levine on the set of "The Voice," in Los Angeles. The contest between "The Voice" and "The X Factor" is escalating after NBC scheduled its "Voice" against Wednesday's second-season debut of Fox's "X Factor." (AP Photo/NBC, Tyler Golden)
This June 2012 photo released by NBC shows mentors, from left, Blake Shelton, Christina Aguilera, Cee Lo Green and Adam Levine on the set of "The Voice," in Los Angeles. The contest between "The Voice" and "The X Factor" is escalating after NBC scheduled its "Voice" against Wednesday's second-season debut of Fox's "X Factor." (AP Photo/NBC, Tyler Golden)
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