I saw ELP live back in the day when they were touring behind the (then) newly released 'Brain Salad Surgery' (one of the coolest album covers ever, man am I dating myself!). Greg was playing the Scorpion 8-string Alembic in spots, Keith had the great gag where the grand piano lifted off the stage and flipped end-over-end-over-end, and Carl's drum kit went round & round during his solo. They were touring with a quadrophonic PA, big stacks of bins opposite the front scrims about 50 rows back, and their front-of-house mixer would go nuts with the pan pot in spots.
Keith was touring with that monstrous component Moog rig, and I'm sure his tech is still in recovery from shepherding that monster down the road from show to show. I always dug that he played facing the audience with both arms straight out playing two parts on two rigs without even looking, what a player. I always thought Carl Palmer was very overlooked as an amazing drummer.
Rusty, the show I saw was in the old Sam Houston Coliseum, what a barn, long since torn down.
Far Out, Man ! ! !
J o e y