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The Queen of Pop -- and Royal Rivals
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.
Madonna Live
The Queen of Pop in her element
Sheryl Crow
The hot rocker's career