I can't argue with Crimson's "Red" as an introduction to the joys and excesses of Prog Rock, though I think "Discipline" is a better one.

I feel like this author really does not like prog rock though. Or is working very hard to convince his readers that he is, actually, too cool for this discredited genre of popular music. I am not too cool for it; I am past fifty and I quit caring if my musical choices made me cool somewhere in my twenties. I just like listening to music nerds who have spent decades learning to play incredibly intricate music and make it seem effortless.