I’ll let you read it for yourself, as told by Greg. :)
A little more than halfway down.
https://www.classicrockrevisited.com/show_interview.php?id=141
Read this second
https://en.wikipedia.org/wiki/Lucky_Man_(Emerson,_Lake_%26_Palmer_song)#:~:text=The%20origin%20of%20the%20song,acoustic%20version%20of%20the%20song.
That’s a good story. Thanks for posting it.