Spike Lee’s “Highest 2 Lowest” takes some time to find its groove. But once it does, when the film leaves the high rises and puts its feet on the New York pavement, it really sings. A reimagining of Akira Kurosawa’s 1963 crime thriller “High and Low,” Lee brings the story to a modern-day New York where a music mogul, played by Denzel Washington, is faced with a moral dilemma: Save a kidnapped kid or his flagging empire.