Piano iPad

My daughter  is practicing piano.  Oops, she is practicing  piano using her  iPad.   It's actually  a game but I don't know   if it also needs some scoring.    It turned  me crazy  because she plays  like a real pro playing musical  instrument.  Imagine how it sounds when she puts the loud speaker on.  It's   easy  and  just needs to  follow  the lights and  touch the screen.   You just need to  beat the light  timely  to  create a good sound  like an instrument.  Aside from the entertainment benefits,  one would get  the feeling   like   having  her  own concert with the help  of  this  mini  gadget.