Rick Wakeman. He was such a legendary super man on keyboards at such a young age. Without Wakeman, It is very noticable and lacking. Sure, they made fantastic music but never the same without him. The Wakeman years, early on, was the most magical and grand times for Progressive Rock.
Pink Floyd are a psychedelic/progressive rock band formed in Cambridge, England, United Kingdom in 1965. Pink Floyd is one of rock's most successful and influential acts, having sold over 200 million albums worldwide and with 74.5 million certified units in the United States, making them one of the best-selling artists of all time.
Keith Emerson (1944-2016) was 71 when he died of suicide by a gunshot wound to the head. He was a founding member of Emerson, Lake & Palmer (ELP), one of the early progressive rock supergroups, in 1970. Emerson was widely regarded as one of the top keyboard players of the progressive rock era.