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The Best of Both Worlds joint concert, between R&B singer R. Kelly and hip-hop megastar Jay-Z, may be forced to refund tickets after Jay-Z barred Kelly from the remaining tour dates in the New York area, amid reports of a feud and accusations of an assault.

R. Kelly filed the $75 million lawsuit against Jay-Z and his Marcy Projects production company on Monday, accusing the rapper of "sabotaging" the pair's abruptly canceled Best of Both Worlds Tour.

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