Shakira and Usher will replace Christina Aguilera and Cee Lo Green. Adam Levine and Blake Shelton will return for the fourth cycle. Aguilera, who is working on a new album to be released in November, has made no secret of her desire to make more time for her music. During an interview with Ryan Seacrest on his radio program, she characterized The Voice as a 'side project.' Both Shakira and Usher fit into the Voice mold of recruiting recording artists who are still topping the sales charts. Paul Telegdy, NBC's president of alternative and late night programming, recently told THR that 'a chair on the panel is not a job for life, nor should it be.' And he added that the coach's 'authenticity, relevance and credibility are all wrapped up in what they do and how they define themselves, which is as active, relevant touring musicians. That may mean a seat on the panel becomes available.'.