There was a book out about him some years ago,I've heard. I've never seen the book,so I don't know if it covers that. The best thing is to see him in concert,meet him after the show and ask him then. Personally,I think all his life experiences are why he wrote anything. Those are the best kind of songs. Been me,later!
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Borderstone (An,"Avid Listner" of G.L.)