Oh yeah. I saw them in Boston at The Garden back in...'81 I think. Awesome show. Keith Emerson absolutely destroyed a Hammond (B3?) and turned it into kindling after doing "Hoedown".
Yeah, The era of psycodelia, I was, shall we say, partaking. I think it was Emerson that was playing a portable keyboard and when the song crescendoed it turned into a flame thrower. To say I was amazed would be a huge understatement.