I've been collecting transcriptions of ELP for many years. This one goes back a good 17 years. I had made a few 'pen pals' via USENET rec.music.prog (or was it alt.m.p?) & we'd swap our latest transcription efforts via snail-mail. Nowadays that seems like carving cuneiform into stone tablets! Sorry I can't remember who wrote this out to give credit where it's due! Hope it's helpful.
I thought I once saw Keith's Lucky Man solo transcribed in Keyboard mag... maybe I'm mixing it up with another piece (they've also done Tarkus-Eruption, and bits of Barrelhouse Shakedown, his Piano Concerto & the organ solo from KE9 3rd Impression). Funny thing about this solo is that Keith didn't realize tape was rolling while he was noodling around with some ideas. He really wanted to have another go at it to make it better, but everyone else thought it sounded great as-is!