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The Filharmonic Mash-Up Justin Bieber & Britney Spears

With a talented bunch like the a cappella group The Filharmonic in the YH Studio, we can't help but put their phenomenal talents to the test, so we challenge them to an impromptu mash-up! See what happens when they have to come up with a mash-up of Justin Bieber, Britney Spears, and more right there on the spot!