He is young, dark and handsome, with a lilting light tenor, and he swept the Latin Grammys last year. But should Juan Esteban Aristizabal, better known as Juanes, perform his songs at a "peace concert" in Havana? The debate over the Colombian rock star, who is based in Miami, has now been raging for a month or more on the city's Spanish-language radio and tv shows.
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