Nick Drake is a musical puzzle who, if you exclude Robert Johnson, is unparalleled in his ability to evoke a sadness that can be both inviting and mystifying. Far beyond his obvious musical talents as a guitarist, singer and songwriter, his very life has moved beyond the obvious to take on the myth and/or classical tragedy of a tortured genius unrecognized during his lifetime (think Van Gogh). Family Tree, a release of his demos, home recordings and family tapes, is another piece of the puzzle. It fits easily, filling in large portions of the missing picture. I want to be clear from the start: Family Tree initially seems to be a collection primarily for Nick Drake aficionados or obsessive completists. Many of the cuts are very lo-fi, and the home recorder hiss on “They’re Leaving Me Behind” or the creak ...