WATCH: John Legend surprises commuters

Can you believe it?

John Legend playing the piano at St Pancras

Today is International Piano Day and to mark it, the fantastic John Legend surprised commuters with an impromptu performance.

Taking a seat at one of the famous St Pancras pianos in the London train station, John Legend played three songs including his top five hits 'Ordinary People' and 'All of Me'.

Our friends at Magic were there to capture his performance.

Tickets for John Legend's UK tour go on sale this Friday (31st March) at 9am and you can buy your tickets from Aloud.com

To celebrate International Piano Day we thought we'd find some of the weirdest places you might find a piano.

Although many are just temporary additions, some are permanent believe it or not!

On the Great Wall of China...

Although this appears to have been done for an advert others have also played a piano on the Great Wall of China.

With some elephants...

Radio presenter and musician Brian Lauritzen took a piano out in the open so Peter the elephant could have a play.

Up a mountain...

The Scottish Symphony decided to try and take a piano up a mountain. Nope, we're not sure why either!

Under the sea...

One swimmer took diving to the ocean floor further than most by playing the piano while she was down there.

On a bus...

This commuter decided to take their grand piano on the bus with them, we aren't quite sure how they got it in or out!

Suspended in the air...

This isn't for someone who is scared of heights.

On a farm...

This grand piano had an outing to a farm, we're not sure the sheep really know what to make of it.

In a forest...

This is believed to be a Russian soldier playing an abandoned piano in Chechnya in 1994.

In a desert...

Imagine playing in the sweltering heat of the desert.

On a roof...

Quite the oddity, this piano seems to have appeared in this location overnight.

In a cave...

Going underground - this piano was played in a geothermal cave.