This is Brian Hull.  Brian does voices and he does them better than almost anyone on the planet.  He does them so well that he can sing an entire song, using dozens of different voices, in a single take.  He is constantly making videos where he does impressions of popular characters, but this video is probably one of his best.  Brian sings Adele's "Hello" using only characters from Disney and Pixar.  It's insanely awesome!