Good news does happen, even now. It took a short trip north, a week ago, to find it â€” but there it was, the Green Music Center, in Rohnert Park. It's Sonoma County's hope and prospects for a future in which things can only be brighter. If a concert hall just 84 percent completed can be assuring of its eventual success by its mere appearance, this one goes a long way. Further, it appears to be a near replication of the Seiji Ozawa Hall at the Tanglewood Music Center, by the same architects, William Rawn Associates, and acoustician, Lawrence Kirkegaard.