She's sold more than 2 million albums, just published a best-selling memoir and counts Taylor Swift as a supporter. But as she writes the songs for hotly anticipated Broadway musical, she reveals her feelings about other pop stars and the industry.

"What am i doing right now?" Sara Bareilles has just ­blustered into a German beer bar on New York's Lower East Side, lugging a giant duffel bag. "I'm so frazzled!" she apologizes. "I just got back from the book tour. And for the play, we're in re-­examination mode."

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