Why does the music of the evil sound in kino's ears when the priest visits them?

In "The Pearl" by John Steinbeck, the music of evil that Kino hears when the priest visits symbolizes the corrupting influence of colonialism and exploitation. The priest represents the oppressive societal forces that seek to maintain control over Kino and his community. This unsettling music reflects Kino's growing awareness of the threats posed by those in power and foreshadows the moral and social conflicts he will face as he navigates the consequences of his desire for a better life.