[Instrumental Break] (four low notes curl inward: piano, contrabass, glass violin, struck metal; no melody above them) [Verse] (each voice takes the same hooked figure in its own rhythm, predatory and operational) [Build-Up] (the four figures overlap into Undertow; industrial heartbeat and pump noise drive the ensemble forward) [Chorus] (Aria's broken-bell motif enters against them; the four hooks re-harmonize around her without resolving her line) [Breakdown] (the ensemble becomes a warm, dangerous enclosure with a clear opening left in the center) [Final Chorus] (Aria sets the pulse; each of the four voices enters only after her bell note, then all stop together on a hard cue) [End]
