Tap these cute naughty animated 3D cats/kittens and play music. They are naughty but still very cute. They blink, open their little pink mouths and sing with funny voices. Each kitten corresponds to a piano key with realistic pitch intervals.
Thus, you can play as if you were playing the piano. But kittens are much cuter. They are meowing as if they were talking with funny angry voices. You should hear it.