The Daily Mail published an article showing video footage of Prince William and Harry playing the piano as children for a photoshoot. Here's the Youtube footage
It's great the young princes are exploring the sound world of the piano. No doubt, had they persisted in their interest, they would have had piano lessons.
Earlier in March 2011, before Prince William's Royal wedding, the piano spotlight was on Kate Middleton, who took piano lessons, reaching grade 3, when she was 8 years old in Bucklebury Berkshire, UK.
Kate Middleton's piano teacher David Nicholls composed a "A Song for Kate (and William)" in honour of their wedding.