ELP - Keith was from The Nice, Greg was from King Crimson, and I don't know where Carl came from.
Since I dig bass, I think Greg's extended solo on "21st Century Schizoid Man" with King Crimson is the ultimate bass solo I have ever heard.
(And Noel Redding's bass line made "Purple Haze" for me, not Jimi's guitar.)
By the way, PBS TV is digging up live performances from various dinosaurs in order to trigger fond memories and beg money from us boomers.
Also, this summer is the 40th anniversary of the "First Annual Aquarian Age Music and Arts Festival," aka "Woodstock." How time flies.
I wanted to go but had to work.
I did get to see the movie in wide-screen with quad surround sound, though.