Mark Ruffalo (Marvel Avengers Assemble), Keira Knightley (Atonement) and James Corden (Gavin and Stacey) discuss their new film. Funny, inspirational and uplifting, Begin Again follows Greta (Knightley) and her long-time boyfriend who move to New York to pursue their passion for music. Hosted by Edith Bowman at the Apple Store, Regent Street in London.