WATCH Eddie Vedder covers Warren Zevon - to honor David Letterman

Congrats to David Letterman who was honored at the Kennedy Center over the weekend with the Mark Twain Prize for American Humor.  And, to help mark the occasion, Eddie Vedder showed up to cover Warren Zevon's 'Keep Me In Your Heart' with Paul Schaffer. (Zevon was a good friend of Dave).  The Mark Twain Prize is scheduled for broadcast on PBS on November 20th. Check out cell phone video of performance below