Those early "prog rock" albums opened my ears to a new kind of music , my best mates brother would let us play those albums on his brand new stereo system and use his headphones , Days of future past,in search of the lost chord, threshold of a dream and question of balance , john wrote my favourite MBlues track Ride My See Saw brilliant driving bass lines RIP John
The Moodies were seriously underrated in the grand lexicon of popular music and as you identify, those albums were inspirational in the creation of progressive rock. I was introduced to their music by an older cousin and they definitely helped form my own musical direction.