Heavy Metal edition

What is Progressive Rock?
>https://rateyourmusic.com/genre/progressive-rock/

Good albums to start with?
>https://www.musicgenretree.org/essential_prog.png (embed)

Obscure prog gems
>https://rateyourmusic.com/list/antonbildern/a-secret-society-obscure-progressive-rock-albums/

Previously, on /prog/: >>126955079