Mike Pinder was a founding member, and once the keyboardist, of the band The Moody Blues.  Pinder passed recently.  Mr. Pinder was an acolyte of the weird instrument, The Mellotron.   What was The Mellotron?  I asked ChatGPT to provide some illumination.  Here is what they said: A Mellotron is an electro-mechanical musical instrument developed in the early 1960s. It works by triggering prerecorded sounds stored on magnetic tape when a musician presses the keys on its keyboard. Each key on the Mellotron is connected to a tape playing a recording of an instrument, such as strings, flutes, or choirs, allowing [More]
Here is an easily digestible grouping of profiles on popular progressive rock bands from England.  Witness some brilliant footage of King Crimson, Genesis and those lovable space cadets, Hawkwind in concert.  This video might get you to start searching in depth for more clips on these bands.  I am investigating Genesis.  Such theatricality!  The King Crimson segments featuring the lunatic percussion playing of Jamie Muir are also most memorable.