Jay-Z and Justin Timberlake

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Audiences got a taste of the chemistry between consummate crowd-pleasers Justin Timberlake and Jay-Z at this year's Grammy Awards, when the duo unveiled "Suit & Tie," Timberlake's infectiously bassy update of slick, blue-eyed soul. After that, their "The Legends of the Summer" tour felt inevitable. With his Tom Ford suits and horn section (the utterly watchable Tennessee Kids), Timberlake is fully engaged in a Marvin Gaye moment, making him the perfect foil to cool-guy Hova, who, at 40-plus, still peddles some of the most memorable party jams and menacing rhymes in the business.