Look, the very link OP has posted even has an image which shows that the handspan of the "internationally acclaimed pianists", it is wholly concentrated in abov

Look, the very link OP has posted even has an image which shows that the handspan of the "internationally acclaimed pianists", it is wholly concentrated in above average handsizes. Which only a fairly small portion of the population has. http://smallpianokeyboards.org/wp-content/uploads/2019/02/Right-hand-span-results-with-dots_Dec-2016.jpg http://smallpianokeyboards.org/wp-content/uploads/2019/02/Ri... Never "small". If we are talking about "greats" it's even more so. You can't be with a small hand span. Not sure what kind of more evidence you need.