There have been a number of recent reports of pianists who have been moved to stand while playing. Here's an actual sighting in the wild, with the Benaud Trio's Amir Farid
temporarily leaving the bench at the 3:42 mark.
And as we wind on down the road
Our shadows taller than our soul.
There walks a lady we all know
Who shines white light and wants to show
How everything still turns to gold.
And if you listen very hard
The tune will come to you at last.
When all are one and one is all
To be a rock and not to roll.
Note: in case you're too young or too old to have heard the Led Zeppelin original of Stairway to Heaven, you can find it here
Link to the Original