LONDON (Reuters) - Bee Gees singer Robin Gibb, who with brothers Barry and Maurice helped define the disco era with their falsetto harmonies and funky beats on hits like "Stayin' Alive" and "Jive Talkin'", died on Sunday after a long fight with cancer. He was 62. The singer had colon and liver cancer and, despite brief improvements in his health in recent months, passed away on Sunday evening. Gibb died at the London Clinic surrounded by his second wife Dwina, sons Spencer and Robin-John and daughter Melissa. ...