Pop divas are making a spectacle of themselves

The music industry's female stars are quite literally reaching new heights these days as ever-riskier tour stunts seemingly designed for acrobats are built into the show.Hours before Pink's recent show at Staples Center, creative director Baz Halpin is crouched beneath the stage in the dimly lighted corridor he calls "the underworld." That night, Pink's fans would witness the star scale a giant gyroscope, somersault from bungee cords, dangle precariously from silk ribbons and fly over the aud...