Tapping left and right keys of the piano in turns is called "trill". Play trills as fast as you can to hatch cute chick and clear stages.
You have to hatch eggs within time limits. There are dozens of stages in this game.
You can get some cute characters if you go through this game. Use these characters as items to get some good features!
There are many Game Center achievements. Also, you can tweet your high scores from this app. Compete with your friends using achievements and tweets!
Note: You can mute only sounds of piano from your earphone if you set your iPhone to silent mode. Try it if you feel these sounds noisy.