From the 2003 Eyes Wide Open tour:

One can also see, far stage right in the dark, a keyboard player that I have yet to identify, though I have attempted to do so.

This iteration of King Crimson consisted of:

• Robert Fripp, guitar
• Adrian Belew, guitar
• Trey Gunn, Warr Guitar
• Pat Mastelotto, drums

BZ

P.S.
For full experience, expand the video to full screen, don thy headphones and turn up the volume!