A summer night of love for protest songs of the Sixties They came from the 1960s. Most were in their sixties. But the crowd listening to Crosby, Stills & Nash in Bethlehem, PA did cross generations, and even the youngsters were singing the tunes that gave a bittersweet taste to those years seemingly long ago. The band, however, brought them to the stage at MusikFest's RiverPlace Tuesday night. With a vengeance. They opened with "Carry On," and on a sour note to boot. Oh lordy, if this was the sound they were going to offer all night long, this was...