David Crosby, Byrds and Crosby, Stills & Nash Co-Founder, Dies at 81

 David Crosby, Byrds and Crosby, Stills & Nash Co-Founder, Dies at 81

Singer-songwriter-guitarist David Crosby, a founding member of two popular and enormously influential ’60s rock units, the Byrds and Crosby, Stills & Nash (later Crosby, Stills, Nash & Young)…