He did a lot of hard drugs in the 70's & 80's plus he was an alcoholic, too. I always wondered if that kind of abuse leads to or makes a person more prone to have alzheimers ?
I've always enjoyed his music, and probably he was in the top 3 all time guitar greats in Country Music. Right up there with Chet Atkins & Roy Clark, talent wise.
Most people don't know that he toured with the Beach Boys when Brian Wilson had his mental break down. Also, at one time, he had played Guitar on more recorded albums than any other Musician.
He also played Guitar on the recording of the Instrumental song, "Classical Gas" . The guy whom wrote and supposedly recorded the song, Mason Williams, was from my home town, but Glen actually layed down the tracks for the Record. He also layed down the lead guitar tracks for a lot of the Beach Boys biggest hits.
Through cupped hands 'round the tin can I pretend to hold you to my breast and find That you're waiting from the backroads By the rivers of my memories Ever smilin' ever gentle on my mind