WASHINGTON – OCTOBER 16: People sing Life Every Voice And Sing during a dedication ceremony at the Martin Luther King Memorial on the National Mall October 16, 2011 in Washington, DC. President Barack Obama, entertainers, civil rights leaders and others attend the ceremony to formally dedicate the memorial to the civil rights leader Rev. Dr. Martin Luther King who was assassinated in 1968. (Photo by Brendan Smialowski/Getty Images)