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Adam Levine

In ‘Begin Again,’ Keira Knightley tunefully leaves comfort zone

NEW YORK: British actress Keira Knightley, known for playing tragic heroines in period dramas, strayed into new territory with her first major singing role in "Begin Again," a feel-good film about the music industry and starting over. "Begin Again," which opens in limited release on Friday and nationwide next month, was written and directed by Ireland's John Carney, whose 2006 indie musical "Once" nabbed the best original song Oscar for "Falling Slowly." "Once" was also adapted into a Broadway show and won eight Tony…