Spoilers for my list... I've only ranked songs from Stupid Dream through The Incident, not including the EPs. I've been meaning to get around to the rest of Porcupine Tree's discography, but as of this point in time, I just don't know those albums/EPs well enough or at all to include (although I feel bad that I forgot to rank Dark Matter, that totally would've appeared somewhere in at least the Top 30). But I am aware of PT's magnum opus, "Message From a Self-Destructing Turnip", and I will be very disappointed if it does not take the top spot.
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My ranking: (Not ranked, haven't listened to)
Where We Would Be
My ranking: #54. This one didn't make my list, but this song has grown on me over time. I like the atmosphere of this song a lot, and the lyrics are pretty good. Not much else stands out, but it's always a pleasant listen.