Today on the Greatest Pop Stars Podcast, host Andrew Unterberger is joined by Billboard executive digital director Joe Lynch and senior charts/data analyst Eric Frankenberg to talk about our No. 6 Greatest Pop Star of the 21st century, Britney Spears. We talk about Britney's incomparably iconic 2000s run and the classic albums, singles, videos, performances and cultural moments that cemented her legacy -- as well as the triumphs and tragedies of her last 20 years in the limelight, and the few timing factors largely holding her back from making the list's top five.

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