Prog Rock for a Beginner

Hey y’all, I’ve become a huge KGATLW fan over the last few years, and some of my favorite albums are their more prog rock ones. But outside of Gizzard and Rush (which I really like, especially Moving Pictures which I just bought on vinyl), I don’t have much experience with the genre.

I wanna start with the early prog stuff as I work my way to the present, so I listened to a some of Yes’s early albums and some Jethro Tull and Moody Blues, but it’s not quite clicking yet. Anyone here have any suggestions for early to mid prog rock albums I should check out next? Or if there is any specific band that was an inspiration for KGATLW’s work that I should aim for? Thanks in advance!