Grace Potter & the Nocturnals: The Lion The Beast The Beat

IT MUST BE FRUSTRATING to be Grace Potter. So much talent, such a fierce band, the kind of charisma that can't be taught, exuding sex and wallop with every turn — and yet, the superstardom she seems test-tubed for has eluded the Vermont-born songwriter who can rock as hard as anyone, yet exhale a ballad with knee-buckling vulnerability. Whatever the missing factor is — songs? connection between the high-gloss image and blues-steeped music? a coherent format to break out of? — it remains elusive.