This undated image released by NBC shows mentors, from left, Adam Levine, 

This undated image released by NBC shows mentors, from left, Adam Levine, Shakira, Usher, and Blake Shelton on the set of the singing competition series, "The Voice," in Los Angeles. "The Voice" begins its new season 8 p.m. EDT Monday, March 25, with another two-hour episode. NBC said Monday that the show will double to two hours on April 30 and May 7 to showcase pivotal rounds in the singing competition. (AP Photo/NBC, Adam Taylor)
Associated Press
This undated image released by NBC shows mentors, from left, Adam Levine, Shakira, Usher, and Blake Shelton on the set of the singing competition series, "The Voice," in Los Angeles. "The Voice" begins its new season 8 p.m. EDT Monday, March 25, with another two-hour episode. NBC said Monday that the show will double to two hours on April 30 and May 7 to showcase pivotal rounds in the singing competition. (AP Photo/NBC, Adam Taylor)
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