Today on the Greatest Pop Stars Podcast, host Andrew Unterberger is joined by Billboard's Josh Glicksman and Kristen Wisneski to talk about our No. 8 Greatest Pop Star of the 21st Century, Justin Bieber. We talk about what makes The Bieb the highest-ranked traditional male pop artist on our list, and why his rise to ubiquity was still very representative of (and impactful on) the 21st century -- while also sharing some personal memories of peak Bieber Fever and attempting to defend some of his less successful periods.

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