This was later confirmed this during a track-by-track commentary, explaining that the track is purely the “resonant tolling” of the bell. There are no hidden vocals, no beat drops, just the fading vibrations of history. And as RM explained, it’s 1:37 minutes long, because that’s how long it takes for the sound of the bell to fade out, and it signals a transition from more hype to a quiet, and mellow tone.