Music to his ears

After his return from a children’s party, 10-year-old Angelos starts behaving very strangely. Instead of people talking, he only hears music playing. As a result, he shuts himself off from the world and stops communicating with all those around him. His parents are worried while trying, in vain, to understand what is happening to him. The answer will be given in the next party, when he meets again Evelina, a girl his age.