I'm a Glen fan too @berdie and it's hard to narrow it down to which one of his is my favorite.
He's one of those artists I didn't really appreciate until I got older @libertybele .
Great vocal range and could play most any stringed instrument. 
@berdie @libertybele Me too. I didn't appreciate Glen until after he passed. When I read the comments on his videos, I see that I'm not alone. Most people have similar experiences. Either later in life or after his passing. What I lacked in interest in the earlier years, I've more than made up for it. I'm one of his biggest fans now!
My 2 favorite songs of his hits are "Wichita Lineman" and " Southern Nights." The only one I really don’t like was his biggest hit – “Rhinestone Cowboy.”