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Chord progression

An ordered succession of chords whose harmonic relations establish, prolong, redirect or destabilize tonal and modal expectations.

Version
v2 · 2026-09-19 · History
Domain-specific #
3676
Domain group
Arts & Aesthetic Practice
Origin domain
Music & Musicology
Subdomain
Music Theory → Music & Musicology
Aliases
Harmonic progression, Chord changes

Core Idea

A progression is more than an unordered chord collection, functional interpretation depends on key mode style and voice leading, and identical chord symbols can behave differently in different tonal or modal contexts. Successive sonorities preserve common tones and move voices while root relations and scale-degree functions create tension, expectation and resolution across time, often organizing phrases and larger form. The abstraction is therefore identified by a declared carrier, a transformation or constraint over that carrier, and an invariant that tells an analyst whether the named structure is genuinely present.

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Chord Journey

A chord is a few musical notes played together. A chord progression is a line of chords, one after another, like steps in a dance. Some chords make the music feel like it's waiting, and the next chord makes it feel like it's home again. The order matters: the same chords shuffled around feel different.

Chords in Order

A chord progression is an ordered series of chords in a piece of music. It isn't just a pile of chords — which comes first and how long each lasts both matter. As one chord moves to the next, some notes stay the same and others step up or down, and this movement builds a feeling of tension that then relaxes, like a question and an answer. Progressions often mark the ends of musical sentences (called cadences). The same chord can feel different depending on the song's key and style.

Ordered Harmonic Succession

A chord progression is an ordered sequence of chords unfolding in time, not an unordered set. Its meaning depends on context: the key or mode, the style, and how individual voices move from chord to chord (voice leading). Moving between chords keeps some common tones and shifts others, while root movement and each chord's function in the key — like tonic, predominant, dominant — create tension, expectation, and resolution. Progressions shape phrases, especially at cadences, and larger musical forms. The same chord symbol can function differently in different keys or in modal rather than tonal music.

 

A chord progression is an ordered, rhythmically placed succession of sonorities whose meaning depends on its tonal or modal context. Successive chords retain common tones and move voices, while root relations and scale-degree functions (for example tonic, predominant, dominant in functional tonality) generate tension, expectation, and resolution over time. Progressions articulate phrases and larger form, with cadences marking phrase endings, and they may employ repetition, substitution, or modulation. Analysis must specify the chord content including pitch and inversion, the key, mode, or tonal center, whether a functional or modal interpretation applies, root motion and voice leading, nonchord tones, and phrase position. Because functional interpretation depends on key, mode, style conventions, and voice leading, identical chord symbols can behave differently in different contexts, and an unordered set of chords does not constitute a progression.

Scope of Application

Chord progression belongs to music theory and is useful where the analyst can specify the typed music theory carrier, including objects, relations, parameters, conventions, evidence, boundaries, and comparison targets, then evaluate the ordered chord sequence and temporal rhythm, pitch and inversion content, key mode or tonal center, harmonic-function or modal interpretation, root motion and voice leading, nonchord tones, cadence and phrase position, repetition substitution or modulation, style conventions and perceptual expectation are explicit.

Clarity

The abstraction clarifies a crowded vocabulary by making the ordered chord sequence and temporal rhythm, pitch and inversion content, key mode or tonal center, harmonic-function or modal interpretation, root motion and voice leading, nonchord tones, cadence and phrase position, repetition substitution or modulation, style conventions and perceptual expectation are explicit the center of the account. A claim should name the carrier, the governing operation or relation, the applicable assumptions, and the recognition test.

Manages Complexity

Without the abstraction, an analyst must reason directly over many local details: the carrier roles, admissibility assumptions, competing conventions, derived invariants, boundary cases, and proof or validation obligations specific to Chord progression. Chord progression compresses them into the roles in the structural signature. That compression permits comparison across instances without erasing the variables that determine validity. It also exposes which details may be varied safely and which are constitutive.

Abstract Reasoning

  1. Identify the carrier. State what the elements, states, objects, or observations are: the typed music theory carrier, including objects, relations, parameters, conventions, evidence, boundaries, and comparison targets. Reject examples whose alleged carrier belongs to a different problem.
  2. Lock the constitutive rule. Express the ordered chord sequence and temporal rhythm, pitch and inversion content, key mode or tonal center, harmonic-function or modal interpretation, root motion and voice leading, nonchord tones, cadence and phrase position, repetition substitution or modulation, style conventions and perceptual expectation are explicit independently of one notation or implementation.

Knowledge Transfer

Knowledge transfers strongly among subfields of music theory because they reuse the typed music theory carrier, including objects, relations, parameters, conventions, evidence, boundaries, and comparison targets, Successive sonorities preserve common tones and move voices while root relations and scale-degree functions create tension, expectation and resolution across time, often organizing phrases and larger form., and type the carrier, state every parameter and convention in the definition, test that the ordered chord sequence and temporal rhythm, pitch and inversion content, key mode or tonal center, harmonic-function or modal interpretation, root motion and voice leading, nonchord tones, cadence and phrase position, repetition substitution or modulation, style conventions and perceptual expectation are explicit, compare the nearest accepted identity, and report counterexamples, uncertainty, and limiting cases.

Relationships to Other Abstractions

Local relationship map for Chord progressionParents appear above the current abstraction, mutual partners to the right, and children below. Node labels state whether each abstraction is prime or domain-specific; colors identify relation types.Chord progressionDOMAINPrime abstraction: Temporal Dynamics — is a kind ofTemporalDynamicsPRIME

Current abstraction Chord progression Domain-specific

Parents (1) — outgoing typed relations

  • Chord progression is a kind of Temporal Dynamics Prime

    It remains its own entry because its identity is fixed by the ordered chord sequence and temporal rhythm, pitch and inversion content, key mode or tonal center, harmonic-function or modal interpretation, root motion and voice leading, nonchord tones, cadence and phrase position, repetition substitution or modulation, style conventions and perceptual expectation.

Hierarchy path (1) — routes to 1 parentless root

Neighborhood in Abstraction Space

Chord progression sits in a crowded region of the domain-specific corpus (0th percentile for distinctiveness): several abstractions share nearly its structure, so a description that fits it tends to fit its neighbors too.

Family — Music Theory & Performance Techniques (23 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-25