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Spanish tenor Placido Domingo sings during a rehearsal in Copenhagen, Denmark Tuesday April 4, 2006. Domingo will sing a portion of Richard Wagner's "Ring of the Nibelungen" on April 7 on the stage of Copenhagen's new opera house. The performance is a prelude for the new stage's spring production of Wagner's four-opera marathon of gods, humans and dwarfs that draws on themes from Nordic and German mythology. (AP Photo/John McConnico)