WASHINGTON, DC - MAY 16: Glen Campbell performs during the Alzheimer's Association Evening with Glen Campbell at The Library of Congress on May 16, 2012 in Washington, DC. (Photo by Kris Connor/Getty ... more 
WASHINGTON, DC - MAY 16: Glen Campbell performs during the Alzheimer's Association Evening with Glen Campbell at The Library of Congress on May 16, 2012 in Washington, DC. (Photo by Kris Connor/Getty Images) less 
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Getty Images | Photo By Kris Connor / Getty Images
Wed, May 16, 2012 10:07 PM EDT