The song is built on the guitar, a droning part with fun slides up and down the fretboard into cool, minimal fingerings. The vocal is instinctual and restrained, breaking into efficient falsetto. Verses drone into lulled choruses, all designed to lead into a beautiful ending guitar/drum breakdown.

When this song was new, I spent so many repetitions of this song waiting for that final section, how the guitar sings out in true minor chords, how the syncopated drums enter and hit spacey accents, how the little voice soars over.

The song sounds so dark and ominous. Of course for Radiohead it's a love song, talking about love's ability to overturn fatalism.
"Think about the good times and never go back." It's worth a try.