One of the world's richest rappers, Jay Z surprised train passengers when he joined them on London’s subway train after his performance at the O2 arena in London.

One of the world's richest rappers, Jay Z surprised train passengers when he joined them on London’s subway train after his performance at the O2 arena in London.

He was accompanied by producer Timbaland, his close friend Chris Martin,  manager Ty Ty and Atlanta Records executive Michael Kyser.

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