Script for a Jester’s Tear has already been mentioned (as have gigs by them - and I saw many between ‘82 and Fish’s departure, so some of us likely at same gigs!). It did make an impression when I first played it, but maybe not quite blowing me away at first listen as much as these (though it rapidly grew on me and is still a firm favourite):
Led Zeppelin II - opening with Whole Lotta Love my intro to the band, and to heavy rock, 1969 IIRC. Brilliant.
Deep Purple in Rock. I was familiar with and liked the band through their first incarnation, bought this and was completely blown away: From the intro/Hard Lovin’ Man to the stunning Child in Time, this was a stunning album.
Paranoid - Black Sabbath. Another 1970 album, with heavy rock taking the world by storm that year! I already knew and loved the title track, but this widened the experience, from Fairies Wear Boots to War Pigs - wonderful!
Dark Side of the Moon. (Pink Floyd) - a bit of a change from the previous Floyd albums, more mesmerising... no, their earlier albums did mesmerising, maybe this was just more upfront, while akso being more cohesive as an album, from Breathe right through to the closing Brain Damage and Eclipse
In the Court of the Crimson King - King Crimson - another wow album, launching with 21st Century Schizoid Man, Then through the contrasting quieter tracks like and to the powerful Court song itself.
Tommy - The Who. Into a musical journey that engulfed for an hour and a half
The Lamb Lies Down on Broadway - Genesis. I liked their earlier albums, but this was something different. More engrossing, and very good sound quality to boot.
Ooooh, I could go on! And all of these still get played today,...