My sister just sent me this link.  It's from 1989.  This was a benefit concert called Our Common Future, and the performance was a one off.  Video and sound quality is pretty good.  Performance is excellent.  Wayne is wonderful, especially his intro.
 
keyboards - Herbie Hancock
sax - Wayne Shorter
vocals - Joni Mitchell
guitar - Andy Summers
bass - Larry Klein
drums - Omar Hakim

Only got a little into it before She pointed out that she was trying to sllep, but it was enough to fortify the two main preconceptions I went in with from the list of the line-up, to wit: 1) Overall, quite nice; 2) Why the hell would you give Andy Summers a guitar when you have Joni Mitchell?!?!?
 
Peter

LOL!