I find that part of his history fascinating. We watched a documentary on the Wrecking Crew (the LA session musicians that included Glen). It is definitely worth finding if you are a fan of sixties music.He was an extraordinary talent. Many folks may not know that prior to his solo career and touring with The Beach Boys, he was a much in-demand session guitarist. I read yesterday that he played on 586 songs just in 1963! Among hundreds of others that's Glen on Mr. Tambourine Man (The Byrds) and You've Lost That Lovin Feeling (Righteous Bros.)