There is nothing wrong with singing about peace and caring for the world. These are all virtues taught and practiced by Jesus. There's nothing wrong with even singing about death and despair as long as it is done within the framework of truth and God's redemptive purposes. Understand that God is reality, His word is truth, and His son, the Lord Jesus Christ, is salvation from sin. Heavy metal mocks this.
Pop music ignores it.
As we saw in Part I, the primary reason for our existence is to know and experience God an act called worship. Understanding only too well fallen man's tendency to lose sight of eternal things and reduce reality to a head-long quest for emotional and physical satisfaction, God cautions us throughout the scriptures to seek first His kingdom and not let the world's system wear us down. Make level paths for your feet and take only ways that are firm. Let your eyes look straight ahead. Hundreds of years later, Jesus amplified this teaching when he said that our eyes should be single, completely focused on God.