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Photo: Scott Olson/Getty Images
Beyoncé, Kelly Clarkson, and James Taylor are already signed up for the serious swearing-in half of Obama’s inauguration, but here are your party performers, who will be divided among two official balls and a children’s concert: Katy Perry, Smokey Robinson, Usher, Stevie Wonder, fun., Brad Paisley, Marc Anthony, John Legend, and the cast of Glee. Is the inaugural oath short enough to fit on a Katy Perry minidress? We will find out!