so,for example,the child playing a simple piece of music on the piano is practising playing the piano and engaging in the norm-governed practice of piano playing and, hence,acquiring and exercising the capacity (to some extent or other) to play the piano,where this involves the ability to engage a series of relatively precise bodily movements in a way that is normativel structured both by formal norms,expressed through the musical notation of the piece,and informal norms,relating to expressiveness,musicality,etc.