'Rhinestone Cowboy' singer had Alzheimer's
                                
                                
                                    (Newser) -
                                    Legendary singer Glen Campbell is dead at 81, his rep confirms to  Rolling Stone . Campbell, who recorded such hits as "Rhinestone Cowboy" and "Wichita Lineman," revealed he had been diagnosed with Alzheimer's in 2011,  embarking on a farewell tour  and releasing his final original album that...