By Denny Dyroff, Entertainment Editor, The Times Kate Gaffney The Philadelphia area has for a long time maintained a tradition of producing top-flight female musicians – from highly-sought L.A. session bassist Lynne Davis and jazz vocal extraordinaire Billie Holiday to pop/rock singer P!NK and punk rock pioneer Joan Jett to legendary R&B/soul singer Patti LaBelle to world superstar Taylor Swift. Included...