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Justin Timberlake adds summer tour to comeback trail

US singer Justin Timberlake performs on stage at the BRIT Awards 2013 in London on February 20, 2013. Timberlake stepped up his return to the forefront of pop music Friday with news that he'll team up with Jay-Z this summer for full-scale concerts in a doJustin Timberlake stepped up his return to the forefront of pop music Friday with news that he'll team up with Jay-Z this summer for full-scale concerts in a dozen major North American cities.