Enhancements for the pc keyboards to play music:

A pressure sensitive layer should be mounted below the keys to enable touch sensitive playing(piano/FORTE). Optimized keyboard drivers might accelerate key-tone-reaction and enhance the playing of strong chords. (Polyphonie) Extra keys (eMail, WebCam etc) might be placed regularly on a 6th row. This makes it possible to also give them an extra tone allocation (e.g. for an extra Accordion-Row). But in general: The existing key layout is sufficiant for excellent music playing! Layout like on an piano is not necessary, as Bajan-Samples show! Who is able to help realizing the previously listed enhancements? Who ever likes may mark special keys with palpable material to give his fingers a better orientation. You may practice with headphones to avoid disturbing neighbours. And - contrary to a piano - you may take your keyboard everywhere.

Summary: Paint, watch and read with (Touch-)Screen (iPad). Talk and sing with your voice. Write and play with your fingers and keyboard.