Ok so is it 13/8 or not???

[Bob Lentil]

I'm pretty sure it's in 4/4 at the beginning (listen to the drums). I found a tab that claims Fripp is laying down a sextuplet on each beat. It sounds plausible, but I'm not going to vouch for its accuracy, because I can't play it. You can check it out here. Scroll down to the part submitted by Reginald Hunt.