The idea of disappearing into the woods and re-emerging as a new person is like the stuff of fairytales; on the face of it, Neil Young would reject all that junk, until he remembered that it actually happened to him. The year was 1970, and Crosby, Stills, Nash, & Young were at the peak of their powers, and yet, amid their songwriting dynasty, the world was rapidly changing around them, and as artists within a scene that prided itself on a socia…