This youtube link gives you an idea of how remarkable this experience is for all S & G fans (and elmo and grover too)
Paul Simon & Friends
Title: The Library Of Congress
Release Date: 6th July 2009
In May of 2007 the Library of Congress gathered an unprecedented group of musicians together in Washington, D.C., to honor Paul Simon as the first recipient of the Gershwin Prize for Popular Song. Alison Krauss, Stevie Wonder, Lyle Lovett, Ladysmith Black Mambazo, Marc Anthony, Art Garfunkel and a host of others joined Paul onstage in a multicultural tribute to the music of a great American artist and a great American art form.
This gala event, called "the greatest night of popular music ever presented in our nation's capital," was beautifully filmed and captured with stunning 5.1 Surround Sound for a truly pure concert experience.