I really like this idea. Simple interface, a single goal, it and it doesn't claim to be a full piano course. However, the user experience is incredibly frustrating for amateur players like myself. For some reason i have to hold down each previous note or else it fails? And often when I do play the right note I get no feedack to say so. Another thing is the annoying wait between listening to the piece and playing every time. It would be nice if user input immediately cut out the example piece