I'm tremendously saddened to hear of the death of Keith Emerson. Emerson Lake & Palmer were a fundamental cornerstone of my broadening musical world-view throughout the early to mid-1970's and although many records from that period would later disappear from my collection during the great punk cull, ELP's self-titled debut, 'Tarkus', 'Pictures at an Exhibition', 'Trilogy' and 'Brain Salad Surgery' never left the family.
The quality of this clip is quite poor, but just watch those fingers go.
Here's Keith (and Carl Palmer) on the Oscar Peterson show, performing Keith's 1976 solo release, 'Honky Tonk Train Blues'.