DENMARK - JANUARY 01:  Photo of EMERSON LAKE & PALMER; ID#: ELPe 28, Keith Emerson, ELP, Emerson, Lake & Palmer., Copenhagen, Denmark  (Photo by Jorgen Angel/Redferns)

One of the most prolific rock keyboardists, Keith Emerson, passed away last night at the age of 71.

Synonymous with the progressive rock movement, Emerson was one third of the supergroup Emerson, Lake & Palmer.  He was widely considered one of the most technically proficient keyboard players in rock history.

He frequently inserted classical music idioms into his compositions and solos, and has contributed some of the keyboard’s most demanding music to the rock canon, such as Karn Evil 9.