Vice President Joe Biden and his wife, Jill, arrive at the Neighborhood Ball. (Gerald Herbert / Associated Press)
President Barack Obama, appearing with First Lady Michelle Obama, speaks at the Youth Inaugural Ball. (Abby Brack / Getty Images)
Guests at the Youth Inaugural Ball cheer the arrival of freshly inaugurated President Barack Obama and his wife, Michelle. (Saul Loeb - AFP/Getty Images)
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Pop rock band Maroon 5, with lead singer Adam Levine, performs at the Neighborhood Inaugural Ball. (Win McNamee / Getty Images)
Rock band the Grateful Dead performs at the Mid-Atlantic Inaugural Ball. (David McNew / Getty Images)
Adam Levine of Maroon 5, Faith Hill, Jaimie Foxx, Beyonce, Alicia Keys and will.i.am perform at the Neighborhood Inaugural Ball. (Max Whittaker / Getty Images)
President Barack Obama and First Lady Michelle Obama appear at the Neighborhood Ball, their first of 10 official balls for the night. (Win McNamee / Getty Images)
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Husband-and-wife duo Jennifer Lopez and Marc Anthony perform at the Western Inaugural Ball. (Jeff Zelevansky / Getty Images)
Vice President Joe Biden and his wife, Jill, dance during the Commander-in-Chief’s Inaugural Ball. (Haraz N. Ghanbari / Associated Press)
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Will.i.am of the Black Eyed Peas performs at the