Ok, so we don't really know that it's Kobe Bryant playing the piano in this clip. It could just be the professional editing of a commercial to allow for that impression. But it's well known that Kobe is one of the smartest NBA players of his generation, or at least one of multi-cultured ones. 

He speaks English, Spanish, Italian and some French, from his days living in Italy as a child. Would it surprise you if Kobe was a boss on the keys?