Stevie Nicks' weathered yowl is singular in pop; it helps her play world-weary sage and romantic enchantress with equal vigour, and gives dramatic heft to her storming treatises on being an independent woman. “Edge of Seventeen” combines an agitated riff with naturalistic imagery and Nicks' impassioned vocal, creating a rallying cry for those living on the precipice; the sweeping synths of “Stand Back” swirl around Nicks' voice, adding depth to her portrayal of solitude. Nicks' duets with fellow stalwarts Don Henley and Tom Petty showcase her star power, with the Petty collaboration “Stop Draggin' My Heart Around” conjuring beauty from its vocalists' similarly coarse instruments.