Elvis Costello was just hosting Letterman's show. Dave is a. Qitting b. Dying. Whatever the case, Elvis Costello was the host and the musical guest.
During the last few minutes he turned his hour of TV time to do something that absolutly no one on late night comedy tv shows has done so far! He made a plea for peace! He sang "What's so funny 'bout peace love and understanding" and closed by thanking dave and advocating peace!!!!!!!!!!!!!!!