The spacecraft landed with friendly aliens who brought a melody so beautiful that all the world was entranced. People were unable to fight after hearing their song only once. Wars ceased. Violence left the soul.
Dubbed The Ali-Tones, they literally brought world peace. Happiness.
Then the heavens and skies grew dark with the millions of other space spheres arriving. The musical alien race left a planet doomed to explode and found a very suitable new home—one filled with a population that would offer no resistance in the slightest way. The music would dominate them completely as new masters took over.