Pentatonix Cover Pharrell William’s “Happy” – VIDEO 03/17/2014 mj santilli Pentatonix, The Sing-Off 10 I dare you not to smile as you listen the new cover from the Sing-Off season 3 winners, Pentatonix. The quintet’s infectious rendition of Pharrell William’s “Happy” will make your day. I promise. The breakdown at the end is especially awesome. Unicorns and rainbows for everybody!