If ever you have a friend, colleague or randomer in the pub who tries to argue that Beyoncé is not the real deal, show them this video.

Footage of the isolated vocal - i.e. her voice without the music - from her Grammys performance has been revealed, and to say it's impressive is an understatement.

Not only is her voice pretty much flawless, but the fact that she didn't miss a bar, hit a bum note or go off key in any way while also practically lying horizontal at one point - that's a talent.

Adele - take note. This is how you do big performances and kill it.

Watch it below: