In a shocking surprise that left her fans in tears, Susan Boyle pulled out of Sunday's "Britain's Got Talent "live tour after doctors told her the stress would be too much for her. The 48-year-old Scottish singer was due on stage for a matinee and evening show at the Manchester Evening News Arena, but concert-goers were greeted at the door with notices announcing she would not be performing. The tour hits Boyle's native Scotland Monday night, but it is still unknown whether she will be fit enough to perform at Glasgow SECC. The church volunteer, who shot to worldwide fame after stunning a l