@bdp24
"
Emerson got a lot of credit for being a "Classically" trained keyboardist playing Rock music. He did that, though, not by using Classical compositional knowledge to create new, song-form music, but rather by playing music written by Classical composers for an orchestra, in a Rock band."
This was only a small amount of Emerson's material. Most of his output were original compositions, informed by classical composition.
Tarkus, Karnevil 9, Take a Pebble, The Endless Enigma, Trilogy, just to name a few.