Music legend Glen Campbell has announced he's suffering from Alzheimer's disease. The 75-year-old singer of such country classics as 'Rhinestone Cowboy' and 'Wichita Lineman' got the diagnosis about six months ago, though he's been experiencing short-term memory loss for several years now.

Campbell is refusing to let the degenerative disorder slow him down. He's going full speed ahead with plans for a fall farewell tour in support of his final album, 'Ghost on the Canvas,' slated for release later this summer.

"Glen is still an awesome guitar player and singer," his wife Kim tells People magazine. "But if he flubs a lyric or gets confused on stage, I wouldn't want people to think, 'What's the matter with him? Is he drunk?'"

"I still love making music. And I still love performing for my fans," Campbell insists. "I'd like to thank them for sticking with me through thick and thin."

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