Stevie Nicks provided a mystical, elusive counterweight to the sweet, frenetic pop and baseline blues of Fleetwood Mac, adding spirituality and spookiness to the group's most tender moments. When she stepped away from the group after Tusk, tensions heightened further within a group already raw from Rumours. Nicks emphasized her tougher side on Bella Donna, singing duets with Tom Petty and the Heartbreakers ("Stop Draggin' My Heart Around") and Don Henley ("Leather and Lace"), while providing a steely adolescent anthem with "Edge of Seventeen." These smashes ensured that her st...