You can choose any level to play! The levels are basically a speed run that you have to finish till the end of these levels to get the piano sheets before the time runs out, that time depends on the piano sheet's length.

All an old composer's piano sheets have been lost in the darkness... neglected and not listened to, forgotten, fading away... But! Now there's hope: you "the hero" comes to revive these old piano sheets and bring them to the light again!