Musical child prodigies have always fascinated the public. Far more rare than the child prodigy performer, though, is the child prodigy composer. The first name that comes to many people’s minds when they think of child composers is Mozart, and it’s true that Mozart started writing music at the age of four or five. But of all Mozart’s great pieces, very few were written before his twentieth birthday. Felix Mendelssohn, on the other hand, composed works when he was fifteen, sixteen, and seventeen that are still considered masterpieces, and that far surpass anything Mozart wrote when he was a teenager.