ARGANDA DEL REY, Spain — Soul diva Amy Winehouse sipped from a glass of red wine and looked a bit unsteady on her feet as she appeared in front of a large audience at the Rock in Rio music festival southeast of Madrid on Friday.
Then, as tens of thousands cheered, she threw off a pair of high stiletto heels in favor of white moccasins, donned a white electric guitar and settled into an intense rendition of some of her best...
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