I "grew up" in the 1960s (I was 11 when it started and 21 when it finished) and listened to lots of music in that period: Beatles of course, Dylan, Who, Cream, Hendrix etc etc
I then got in to "progressive rock" in the late 60s and early 70s - Yes, King Crimson, Doors, Byrds, Love, and many others.
There were of course too many albums to listen in that period (and we all have "blind spots") but one group and album that passed me by at the time was Thick as a Brick by Jethro Tull.
The other day I was looking on the internet for "100 best albums" type lists and some of the lists had "Thick as a Brick" in them.
So I looked around and found it on YouTube (the full album, both sides, all 44 minutes of it).
And what a STUNNING album it is.
While it was obviously recorded in segments the songs all flow in to each other (like Sgt Pepper) so it seems almost one continuous song.
The musicianship is stunning, and they use different time signatures and so on, so even though it is continuous it is never boring.
It reminds me a little of "Close to the Edge" by Yes though not exactly the same of course.
I have now played it half a dozen times on YouTube over the last couple of days, and it is amazing. Strange here I am 66 years old discovering an "new" album after over 40 years.