Seems Like Old Times, Redux — Begin Again, John Carney’s follow-up to his stunning independent film musical, Once (2006), opens with Rashomon precision. We see a down-on-his-luck musician, Steve (James Corden) coax his reluctant friend, Gretta (Keira Knightley) onto the stage at a small bar. She timidly plays acoustic guitar and sings an innocuous complaint ...