Rock star Keith Emerson killed himself because he feared he was no longer good enough as a musician, his girlfriend exclusively told The Mail on Sunday last night. The 71-year-old founder and keyboard player of Emerson, Lake and Palmer was 'tormented with worry' about upcoming concerts in Japan because nerve damage to a hand had affected his playing, said Mari Kawaguchi. She found Emerson's body when she returned to the apartment the couple shared in Santa Monica, Los Angeles, early on Friday morning. He had shot himself with a gun he kept for protection. 'Keith wasn't feeling well on Thursday...