Mariah Carey performs ‘All I Want For Christmas Is You’ with Jimmy Fallon, The Roots & a batch of toy instruments. Fallon follows up his great school instrument performance with Carlie Rae Jepson with Carey’s holiday classic. That is so cool to see raw talent at work. An awesome production of music and creativity. Fallon, Mariah and band have done a wonderful and unselfish, real people type video.