Willner’s T. Rex project,AngelHeaded Hipster: The Songs of Marc Bolan and T. Rex, out Friday, continues that quirky legacy. Kesha’s hard-rock version of “Children of the Revolution” is there, alongside Joan Jett’s faithful “Jeepster,” Nick Cave’s elegiac “Cosmic Dancer,” Father John Misty’s gorgeous “Main Man,” Peaches’ electro-pop “Solid Gold, Easy Action,” and contributions by Beth Orton, John Cameron Mitchell, Perry Farrell, Todd Rundgren, Sean Lennon, and many more.