After the serious business of inauguration is over today, President Obama and thousands of special guests will be able to let loose and party at not one two Inaugural Balls , one of which is so big that it'll be spread over five different exhibit halls of the Washington Convention Center. 

Both of the balls will feature some of music's biggest names, and some stars, like Alicia Keys , will perform at both.  Others who'll be rocking the crowd include Katy Perry, fun. and Usher .

Here's a look at who's playing where tonight in Washington, D.C.:

Commander-in-Chief’s Ball
Alicia Keys
Brad Paisley
Jamie Foxx
Jennifer Hudson
Marc Anthony

Inaugural Ball ( Halls A, B & C )
Alicia Keys
Brad Paisley
fun.
Glee cast
John Legend
Soundgarden
Stevie Wonder

Inaugural Ball (Halls D & E )
Alicia Keys
Far East Movement
Glee cast
Katy Perry
Smokey Robinson
Usher

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