FILE - This June 2012 file 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." New entertainment chief Bob Greenblatt's baby steps strategy of using the successful competition "The Voice" as its centerpiece has helped NBC stand as the only one of the four big broadcasters to have a larger prime-time audience than it had last fall. (AP Photo/NBC, Tyler Golden, file)

Associated Press
FILE - This June 2012 file 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." New entertainment chief Bob Greenblatt's baby steps strategy of using the successful competition "The Voice" as its centerpiece has helped NBC stand as the only one of the four big broadcasters to have a larger prime-time audience than it had last fall. (AP Photo/NBC, Tyler Golden, file)
FILE - This June 2012 file 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." New entertainment chief Bob Greenblatt's baby steps strategy of using the successful competition "The Voice" as its centerpiece has helped NBC stand as the only one of the four big broadcasters to have a larger prime-time audience than it had last fall. (AP Photo/NBC, Tyler Golden, file)
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