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The Queen of Pop -- and Royal Rivals

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Measured by platinum records, chart-topping hits or box-office dollars, Madonna has loomed over the pop landscape for more than two decades. This year marks new chapters in this icon's relentless evolution, including her innovative $120 million multimedia contract with live entertainment titan Live Nation and induction into the Rock and Roll Hall of Fame -- fresh triumphs, fit for a queen. Madonna still reigns, but other musical royalty may offer a challenge to her crown. Meet some of the top pop princesses and other ladies in waiting.
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