Last summer, the world was saddened by the news that legendary country star Glen Campbell was in the beginning stages of his battle with Alzheimer's. Rather.

Associated Press Kimberly Perry, left, Glen Campbell and Reid Perry perform Sunday during the 54th annual Grammy Awards in Los Angeles. Associated Press Glen Campbell, The Band Perry and Blake Shelton perform onstage Sunday during the 54th annual

Glen Campbell performed with the Band Perry and Blake Shelton on the Grammy Awards.

Glen Campbell shares his candid thoughts on battling Alzheimer's disease.

Last summer, the world was saddened by the news that legendary country star Glen Campbell was in the beginning stages of his battle with Alzheimer's. Rather.