Christina Aguilera is rebuilding a cult of personality. Sophie has no use for one

Even at its busiest, though, the music emphasizes Aguilera’s powerful voice, which more than anything is what separates her from the younger stars whose popularity has eclipsed hers in recent years. She runs through the full gamut of moods, from flirty to depressed to joyful to furious — each a response, or so we’ve been trained to think, to some real-life situation.