You can get a free download of the audio from the 2006 broadcast of Martin Luther King National Memorial Foundation Groundbreaking CeremonyAudio Description
At the groundbreaking ceremony for the Martin Luther King, Jr., National Memorial along the Tidal Basin near the Lincoln Memorial, participants spoke about the legacy of Reverend King and the civil rights movement.
The ceremony included speeches by former president Clinton, President Bush, members of Congress, and other dignitaries, as well as musical entertainment by several performers.