**FILE** Billie Joe Armstrong (right) sits July 25, 2012, with Christina Aguilera. Armstrong will join Aguilera as her team's mentor this season on NBC's "The Voice." (Associated Press/NBCUniversal)
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**FILE** Billie Joe Armstrong (right) sits July 25, 2012, with Christina Aguilera. Armstrong will join Aguilera as her team's mentor this season on NBC's "The Voice." (Associated Press/NBCUniversal)
