FILE - In this Friday, February 24, 2012 file photo, Usher makes a guest appearance during a Romeo Santos concert at Madison Square Garden, in New York. NBC says on Monday, Sept. 17, 2012 that Usher and Shakira are joining "The Voice" as new coaches next spring, when Christina Aguilera and CeeLo Green take a break from the show. (AP Photo/Jason DeCrow, File)
