BEFORE THE DAWN (4LPIf Kate Bush had stumbled onto the stage at London's Apollo Hammersmith theater on August 26, 2014, sang "Knees Up, Mother Brown" for 15 minutes, and then wandered off, most folks in attendance would have still felt they'd witnessed something remarkable. After all, it was the first time the gifted and reclusive artist had performed on stage since 1979, and the fact she was greeting her audience at all seemed just short of impossible. Given the craft