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"Happy" is a song written, produced, and performed by American singer-songwriter Pharrell Williams, released as the only single from the soundtrack album for the film Despicable Me 2. The song was first released on July 2, 2013 with the soundtrack, and it was released as a single on November 21, 2013, alongside a long-form music video. The song was reissued on December 16, 2013, by Back Lot Music ... Wikipedia