I don't think it's Keef Hartley: wrong beard & eyes. The fella looks very American: it's not record producer Joe Boyd, is it? Sandy Denny lying on the table?
The chap on the far left might be Aynsley Dunbar...
______
Jim.
Pic with the girl and chap in front of the grandfather clock - the chap is the guitarist John Williams sporting a natty SKY sweatshirt from his time in this now forgotten instrumental "supergroup".
Looking at the original photograph I think second from the left is George Harrison and second from the right is the late Ray Thomas of The Moody Blues.
I have read that they were long time good friends.
scooter
All the men are wearing white jumpers. And a couple have similar necklaces on. This suggests stage costume to me.
I think we're looking at the cast of a play or musical. They could be still be musicians but as part of the performance.
And if they didn't all go on to bigger things it would explain why we're struggling to recognize them now?
some of the closeups are off another photo of the same 'sitting' (OP) can you post those too?
I'm surprised that the people in the original photo haven't been positively ID'd by now.
Started out with nothing. Still have most of it left.
I'm a bit stumped. My thinking was Mad Dogs and Englishmen which is wrong, the Black guy is not Billy Preston so that's not George Harrison? Its not Concert for Bangladesh, that's not Captain Beefheart or Mothers of invention. So maybe they are not musicians at all? I'll have another think