An extraordinary morning is ahead of you. The sun is just shining over the School under the Whispering Tree, where cheerful children are learning, playing and dreaming. Lena, Filip and Zosia are best friends from the first class. Today they came to school early because they couldn't wait for their drawing lesson. But as they walked past the music room, they heard something very strange.... - Do you hear that? - whispered Lena, stopping at the door. Behind the door there was a soft, resonant laughter, as if someone was tapping tiny bells. Philip opened his eyes wide. - Maybe it's Mrs Basia tuning the piano? - Zosia wondered. But Mrs Basia usually came later! The children looked at each other and then slowly looked through the crack in the door. The hall was empty, yet the same sound was coming from deep inside - louder and louder, more and more enchanted. - Maybe someone had left something on the windowsill? - whispered Lena. Philip couldn't stand it. He gently pressed the handle and the door creaked open. At that moment, the musical sound turned into a singing whisper and began to draw the children deeper into the room.... Would they dare to go in and see who or what was laughing in the music room?