Such a fantastic version - they really bring the track to life here. Page brings the excitement to a new level by building on and extending the bare bones guitar solo on the studio version. That is some real Page magic right there.
I stumbled across this on YouTube. Be sure to watch the whole thing. The last 3 minutes or so shows alot of the fans cheering for an encore, then at the very end you see the LED ZEPPELIN light up.
Today on Royal Orleans it was posted that the soon to be released 9/28/71 soundboard includes the set from a fragment of Heartbreaker through Moby Dick.