"Two Arrows", by Real Estate.
This song starts off like some kind of Paisley Underground throwback (not a criticism). It breathes a lot more than a Real Estate song usually does. (It is also in the direction of twice the length of a typical Real Estate song.) Around four minutes in, something locks into place. You know those songs that go round in a seemingly endless circle, looping back on themselves so often that, no matter how often you have heard the song, you have no idea when it is going to end? "I Want You (She's So Heavy)", from "Abbey Road", might be the ur-text for this type of song. It can be an almost stressful listen, in its own way, as you know the song is going to abruptly cut out but you can never be quite sure when. "Two Arrows" does exactly the same thing. (One assumes this isn't coincidental.)
(You kind of wish The Velvets' "What Goes On" did the same thing, instead of fading out; although there is an argument that fading the song out, rather than cutting it out abruptly, leaves a stronger suggestion that the song does, in fact, go on forever. (It's nice to think that somewhere "What Goes On" is continuing to motor its way ever onwards.))
Bonus beats: here they are performing the same song live in the middle of last year, when it was a "new song", and where it heads off in a slightly different, but also very satisfying, direction.