Johnny Cash walked into the rockabilly scene sideways, almost by accident, yet has become the early rock�n�roll figure most admired by generations unconceived during the 1950s and �60s. Joaquin Phoenix stepped into a set of myth-size shoes when he took the role of Cash in the 2005 film Walk theLine (out now on Blu-ray). With his hard, fathomless eyes and stolid, chiseled face, Phoenix...