'Tina' tells Tina Turner's story, with a tribute that keeps on turning

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'Tina' is that rare documentary that leaves you craving an encore, as if two hours weren't quite enough to do Tina Turner's life and career justice. Weaving in a new interview with the 81-year-old icon, the footage then and now underlines the impression of Turner as a force of nature, rocking and rolling with and without Ike.