Love has always been a high-stakes business transaction for Beyoncé, ever since that lousy boyfriend maxed out her credit card in "Bills, Bills, Bills." "Single Ladies" is her definitive statement on that subject. The beat, courtesy of The-Dream and Tricky Stewart, is irresistible and exuberant, the vocal hook is stormy and virtuosic, and her lesson is blunt: Seal the deal. With a shiny ring. Or else.

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