ELP were a true supergroup in progressive rock, elevating the musical genre by taking it out of the science lab and onto FM rock radio, where ultimately millions of listeners would respond in favor.

Each member of ELP had a hand in defining the Prog Rock sound, albeit individually in separate bands, Keith Emerson as a keyboardist, innovator with The Nice; Greg Lake writing and singing on the 1969 King Crimson groundbreaker In The Court of the Crimson King; and Carl Palmer exhibiting power and space-filling percussion in the trio Atomic Rooster.