alright, heres some more of my personal fav prog/psych/hard rock albums from the 70s that most havent heard of outside the genre:
Locomotive (amazing psych/prog with a brass section, very very good!)
Clear blue sky (hard rockin with prog tendencies, 18 year olds playing it)
ginhouse (good mellow prog from the UK similar to cressida/camel)
Hatfield And The North (great canterbury prog...funny and interesting)
Matching Mole (same as above...with more experimentation)
T2 (one of the finest...lots of mellotrons and very emotional)
Blonde on blonde (another solid prog release with amazing melodies)
fuzzy duck (another hard rockin band, much like blackwater park)
Klaatu (psych/prog from canada, some still think its the beatles)
mellow candle (dual female vocal fronted folk/prog...essential!)
Neu (wonderful kraut rock also a favorite of Steven Wilson)
Can (more great kraut rock/prog, even loved by johnny rotten!)
Gracious (a personal fav. Mellotrons, great guitars, and interesting)
Novalis (symphonic prog, like yes or greenslade...sung in german)
Procol Harum (helped invent the genre, UK band of awesome talent)
Renaissance (female fronted vocals, melodic and hypnotic...utter beauty)
Affinity (an edgier female fronted band, original copies sell for $$$)
Spring (the most mellotron soaked album ive ever heard, and great!)
Steamhammer (a proggy/folky deep purplish band from the UK...check it out)
Triumvirat (very accesible german prog sung in english, like nektar)
Nektar (my favorite german prog band. catchy, and melodic with great english sung vox)
Masters Apprentices (psych/prog later on, good melodies and acoustics)
Cirkus (pop/prog with catchy and melodic songs of undeniable effect)
id list more, this thread is speaking my first language
...but i would go on for hours. this should suffice for a while.