I got plugged into ELP in the early 1970s, when I was 12 and followed them through their break-ups and reunions. Rolling Stone has put together a “Ten Essential Songs” page with commentary on each song. Of those, probably Emerson's adaptation of Aaron Copeland's Hoedown shows off his technical skill the best.
It has been a bad last twelve months for those of us that grew up in the 1970s. Chris Squire, Paul Kantner, Glenn Frey, David Bowie, and now Keith Emerson. I saw Todd Rundgren in Atlanta last month. Who knows how many more shows he is going to do, as he is pushing 70. Going to the Steve Hackett show in April. He is 66. Time marches on.
Rest in Peace.