Justin Bieber's videos play like a coming-of-age tale set to irresistable pop, lovelorn R&B and edgy dance music. He grows from an innocent idol who just wants to make "One Less Lonely Girl" in the world, to the swaggering, guitar-slinging "Boyfriend" of anyone's dreams, to a man struggling to find his "Purpose" amid the adoration. Even the choreography becomes expressionistic—an internal struggle, animated.