One of the greatest, alluring and difficult -concerning its deciphering- musical play of all times. Under the pretext of the fairy tale and of the cheerful allegory, a world of mysticism emerges. The theme of the play is the struggle between evil and the good, darkness and light, through clear references in the rituals of Masons. The teachings of Masonism stresses the idea of the battle for ethical catharsis, for the good of all people and principally for the familiarization with the idea of death, a struggle that wins the feeling of fear and lightens life.