Or ELP for short. I just got into these guys a month ago, they have some of the trippiest prog tracks I have ever heard, Keith Emerson is said to be the best keyboardist of all time, though I disagree with that (I prefer the keyboardist from the Fragile era of Yes) but they are definitely worth a listen. My favourite track by them is Toccata by far , it is a delightfully sinister instrumental. http://www.youtube.com/watch?v=1P1RE5v_8FU

You bet. One of the first progressive supergroups. Keith Emerson is fa-nominal. But yes not as good as Rick Wakeman(YES). Karn Evil 9 might be one of the coolest songs ever written.

"Brain Salad Surgery" is a great album and Keith Emerson is a VERY talented keyboardist.

Ever hear some stuff from Emerson's first band The Nice?