Obama sings Sweet Home Chicago

There was a Blues Night at the White House on Tuesday and President Obama joined in a performance of Sweet Home Chicago with Mick Jagger, Jeff Beck, Buddy Guy and B.B. King.  

According to the New York Times: "if every presidential act is symbolic, then showing an interest in music humanizes the chief executive, claiming a connection to culture and emotion."
http://www.nytimes.com/2012/02/23/arts/music/presidents-sometimes-take-the-role-of-first-musician.html