Pianoanne cued me in to a new music app for i-phone and i-pad. It is still free with upgrades coming and I think it is a hit in my studio. Certainly, I don't have time for it every week, but, I have some students staying longer for computer lab and this is a great rhythm teacher.
The colored ribbons must be played on time and on the beat in order to get the most points. Tempos change from song to song and they have three levels of difficulty. Some require quicker fingers than mine and the most difficult levels are fun to play over and over again to get a higher score. Check it out1