David Crosby and Graham Nash stop by to assist Fallon cover another of today's hits as the legendary Canadian rocker.
Mother Monster doesn't approve of Al's "Perform This Way," but you can listen to it here anyway.
Featuring Russell Gland, Lady Gagger... ehhh, you get the idea.
Check out Miley's smash seamlessly turned into the incomprehensible electro-pop jam "Black Umbrella (The Right Stuff)."
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Lorde, you are bold trying to compete with Beyonce. We applaud you.
WHO RUN THIS MUTHAF*****G WORLD.
Vegan cupcakes, to be specific.
Who run the world?
Strange bedfellows, indeed.
What planet is this woman from?
Lea is such a brave soul.
Wicked bad news.
Just like the late great King himself.....
They say love hurts.......
Bound for a Merry Christmas.....
In happier sign language news...
We know who Lena Dunham will be rooting for...