''If You Ever Did Believe''

With a wink and a nod, this emblem of throaty-voiced, witchy-garbed moon-goddessness has written a new single for the Practical Magic soundtrack. From the opening acoustic guitar picking, Stevie Nicks’ ”Baby don’t leave me” song has the comfort of vintage Fleetwood Mac, with top-notch vocal and production assists from kindred spirit Sheryl Crow. When Nicks sings, ”I don’t think I can handle this at all,” she casts a spell of womanly yearning. A-