I love Katatonia, they have quite a few what I would consider perfect songs.
Too many to list, a few that come to mind:
King Crimson, "Starless" -- even the slightly sour notes hit by John Wetton (vocals), all the way to the slow progression of one-note solos, then a two-note solos, then autobahn speeds...
Talk Talk, "The Party's Over" -- starts off slowly, not even hinting at the epic build-up, and this is synthpop?
Joseph Arthur, "All Of Our Hands" -- just sublime for a protest song
David Gilmour, "There's No Way Out Of Here"
Peace Love & Pitbulls, "Youth" -- yeah, it's industrial, but for some reason, my CD player keeps going back to the beginning of this track every time it gets towards the end
Rotersand, "Exterminate Annihilate Destroy"
Gary Numan, "Absolution"
Curve, "Unreadable Communication" -- auralgasm starting at about 2:19
Slowdive, "Catch the Breeze"
New Model Army, "Lullaby"
Portishead, "Roads"