At the beginning of the novella, Kino and his wife are enjoying a typical tranquil morning when suddenly a poisonous scorpion moves slowly down the rope attached to the hanging box, which holds their infant son Coyotito. Immediately, Kino hears the ancient Song of Evil, which is the music of an enemy to Kino's family, warning him of the dangerous scorpion. Unfortunately, Kino is unable to save his son from the scorpion and it ends up stinging Coyotito. After Juana attempts to suck the scorpion's poison out of Coyotito, the family ends up traveling to the town, where they are rebuffed by the prejudiced white European doctor.
As the story progresses, Kino continues to hear the Song of Evil when his enemies approach his hut to steal the pearl. The Song of Evil also becomes associated with the pearl, which leads to the destruction of Kino's family and simple life.
I believe you are referring to The Song of Evil in The Pearl by Steinbeck.
Kino hears songs in his head that are his moral compass and warn him about events to come. The Song of the Family is a good song; it reflects Kino's happy life with his family. However, the Song of Evil is a warning song about the possibility of the destruction of the family:"In his mind a new song had come, the Song of Evil, the music of the enemy, of any foe of the family, a savage, secret, dangerous melody, and underneath, the Song of the Family cried plaintively (Chapter 1, paragraph 14). Unfortunately, the Song of Evil portends the destruction of his family.
The townspeople turn against Kino as greed takes over, and everyone wants the valuable pearl. Kino hears the Song of Evil, and it becomes a metaphor, a comparison, to the scorpion that stings Coyotito. The Song of Evil is the symbol of the family's destruction and the pain that follows the bite of the scorpion.
When does the "Song of Evil" first appear in The Pearl? Provide examples of other songs.
In 'The Pearl' the song of evil appears in certain circumstances, for example, when the family is threatened or when malicious intent or dishonesty is sensed, and it accompanies the doing of bad things or dangerous natural events occur, such as dangerous insects. It is
' "the music of the enemy, of any foe of the family, '
In Chapter One, the Song of Evil threatens to swamp and snuff out the Song of Family, which marks the contentment in Kino's home life, and Kino knows he must become the master of his family’s future after fate seems to turn against them through an evil scorpion bite to his baby son.
He notices the the hanging box cradle seeming to move slightly and this is where the baby is sleeping. It's a scorpion crawling down the string dangling the box. He remembers the Song of Evil, the enemy music, as the Song of the Family tries to compete. He stands motionless, ready to grab the scorpion, but the baby rattles the rope and the scorpion drops down onto his tiny shoulder, biting him. Kino catches the deadly scorpion and manages to kill it while his baby cries with the pain of the poisonous bite, and his wife tries to suck the wound to reduce the poison.