Harmonic Drift

Harmonic Drift names the musical disorder read where harmonic carrying loses retrace to the tonal centre. Where Source Drift names the higher-order condition in which nested carrying is mistaken for source, harmonic drift names that same condition applied to tonal music: the key — the ground of harmonic bearing — becomes unretraceable because the progression has moved too far from it without a recoverable path.

Harmonic Drift is not modulation. Modulation names a tonal move that is retraceable — where a new key is established with enough structural support to carry. Harmonic drift names the condition where the move cannot be retraced and the tonal ground is lost.

Places

Harmonic Drift places the musical disorder read where harmonic carrying loses retrace to the tonal centre.

Holds

Harmonic Drift is held by Applied Read, Harmony, and Source Drift. Harmonic coupling must be present and active for drift to be distinguishable from mere atonality. The structural pattern of source drift — where the carrying structure is taken as the source rather than as carried — must be recognisable.

Pairs

Harmonic Drift pairs with Musical Resolution. Musical Resolution names successful determination of harmonic coupling at scope; Harmonic Drift names its failure — where tonal retrace is lost while surface coherence persists.

Traces

• Applied Read
• Harmony
• Source Drift
• Carrying
• Music

Nests

Harmonic Drift nests within the music domain as the diagnostic read for tonal disorientation. It is the music-domain application of the source drift pattern: a carrying structure (the harmonic progression) has moved far enough that it can no longer be read against the ground it claimed to carry.

Reads

Harmonic Drift becomes recognisable where harmonic progression has moved away from the tonal centre without a retraceable path back — where the listener can no longer locate the key because the progression has drifted beyond the structural support that would make re-entry possible.

It is read where harmonic carrying has become self-referential: where each chord is heard only in relation to the preceding chord rather than in relation to a tonal ground. The harmonic structure carries, but what it is carrying from has become unavailable.

Harmonic Drift is not always a failure. In some compositional contexts — late Romantic chromaticism, impressionist harmony — drift is used deliberately to suspend tonal retrace. The diagnostic question is whether the drift is recoverable (retrace becomes available at the right structural moment) or lost (tonal bearing is genuinely gone and resolution is not available).

Carries

Harmonic Drift carries no further public branch at this scope. It remains an applied diagnostic read inside the music domain.