The last one doesn't fit this theme but is driving me nuts, a side-effect of playing Fallout 4. Yes, Porcupine Tree is another dumb name.

but I went off the more recent albums.

I looked their back catalogue on ProgArchives, they are very well respected, even the last album without David Longden.

I will probably stick with 'The Underfall Yard' album first. This is right in the middle of their vast discography. The pre-Longden material is also well respected.

The big big song (sorry bad pun...!), is something else, and I am still hearing things after so many listens. It's a sure sign of quality music in my opinion if it's that tough to appreciate.