Emerson, Lake, and Palmer

Emerson, Lake, and Palmer was one of the definitive progressive rock groups of all time. They were phenomenally successful, with numerous gold albums. Their piece Karn-Evil 9 is a significant work in prog as it is not only artistic, but divided into separate movements called "impressions". ELP has been considered for the Hall of Fame before, but not chosen. The supergroup was made up of Keith Emerson of the Nice, Gregg Lake of King Crimson, and Carl Palmer of Atomic Rooster. It upset many after Emerson and Lake died in 2016 that the group had not been inducted yet.