Charming and shiny, the Head’s second album asks, but never quite answers, the question “Does the world need more power pop?” The bright-eyed Atlanta trio have mastered the beloved science of catchy, toe-tapping melodies plus rich vocal harmonies, but extreme orthodoxy lends the music an oddly mummified quality, even on appealing, could-be-mistaken-for-oldies like “Top of the World.” More encouraging sounds result when the lads ignore the rules and get a little rougher (“Sneeze”) or sloppier (“What’s Wrong”), indicating they may be ready to unlearn their history lessons/.