For anyone that is moved by art, history and a belief in change.  The incredible contribution of some of the world's best artists were front and centre at today's inauguration of Barack Obama, showing the power of art in our lives and the role that it plays in our combined histories.   Here is the performance of Air and Simple Gifts by John Williams, performed by Yo-Yo Ma, Itzhak Perlman, Anthony McGill and Gabriela Montero.