Sayeth Brian Hull, the man in the above video:
With so many covers of “Let it Go” coming out, people may forget the original Disney magic that this song has, so what better way to preserve that magic with other Disney and Pixar characters singing the song! So enjoy this Disney and Pixar Mashup!
And enjoy it you will! Probably! Provided you want to hear everyone from Jack Sparrow to Scar from The Lion King to Mike from Monsters, Inc. sing the ubiquitous song from Frozen! Which you might, I imagine! Unless you’re some sort of joyless nostalgia-averse misanthrope! And even then, maybe you can just show it to your kids or nephews/nieces or something! They’ll like it! You’ll be the cool dad/mom/uncle/aunt! At least for a while! Okay! End of exclamation points! Goodbye!
Source: BoingBoing