Singer Glen Campbell reveals he's battling Alzheimer's disease

A writer for The Indianapolis Star , in a review of a June 4 Glen Campbell concert in the Indiana city, wrote: "Facing a sold-out audience nestled in a world-class room, Campbell came across as unprepared at best and disoriented at worst. He mangled lyrics (despite unabashed use of video prompts on three onstage monitors), clanged countless off-key guitar notes and generated zero rapport with the crowd." FILE PHOTO Singer Glen Campbell, scheduled to perform July 15 at IP Casino and Spa in Biloxi, Miss., has revealed that he's suffering from Alzheimer's disease