'3 Kings' of hip-hop

The Forbes editor who launched the Hip-Hop Cash Kings list is out with a new book on the biggest moneymakers in the game. 3 Kings: Diddy, Dr. Dre, Jay-Z and Hip-Hop's Multibillion-Dollar Rise by Zack O'Malley Greenburg is three things: a history of the business of hip-hop, a triple biography of Jay-Z, Diddy, and Dr. Dre, and a blueprint of how those guys became entrepreneurs.

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