I think "billy get your guns" would be a good opener, but I think the best openers are band songs like "Lay your hands on me", "I Believe" or even "Livin# on a Prayer".

But what do you think about this:
Concert is over since a few minutes and then David comes back and play one of his instrumental songs like "Kissed by an angel" or "On a full moon" as the very last song.
I think this would be great