Pharrell will be leaving “The Voice” after only four seasons as a coach. The singer and producer joined the show in the seventh season and won season eight with his team member Sawyer Fredericks. Christina Aguilera will also be leaving the show after this season concludes. The two empty coaches chairs will be filled by Miley Cyrus and Alicia Keys on the 11th season of the NBC show. Both artists have worked on the show before, Cyrus this season as an adviser, and Keys as a mentor for Pharrell’s team in season seven.