Beyonce, Kelly Clarkson and James Taylor will already be sereneding President Obama and the crowds on hand for the inauguration ceremony itself, but plenty of other stars will be on hand to help the president celebrate the beginning of his second term. Katy Perry, Smokey Robinson, Usher, Alicia Keys and Brad Paisley will perform at the inaugural galas on Jan. 21. A concert for kids will be held over the weekend as well. Marc Anthony, Stevie Wonder, John Legend will also be making appearances as well as members of the cast of "Glee."