A terrible disease. I saw him live at Moorhead State College, must have been 1968. He was the opening act for the Rightous Brothers! What I remeber most about his performance ws his incredible guitar playing. He did rhinestone cowboy which was his most recognizable record at the time, I think...
I saw Glen at the Houston Rodeo in about ‘75. He came out on a rhinestone swathed horse and sang “Rhinestone Cowboy,” among others. Saw him again around 2004 at 9:30 am at the Moon River Theater in Branson. He was the warm-up for Andy Williams. Didn’t really know why he was a warm-up but it may have been the start of his decline.
Yes, he can play. Usually anyone who worked as a studio musician, as he did, can play very well. I’ve also read that he mostly plays by ear, having difficulty reading sheet music.