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"First Lady Michelle Obama and daughters Sasha and Malia rocked out to performers including Usher and Katy Perry when they joined hundreds of kids from military families and Washington D.C. area schools at the Kids' Inaugural Concert."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/arts-culture/videos/usher-perry-at-the-kids-inaugural-concert>