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Diatonic harmonic progression uses only chords built from the notes of a single major or minor scale, creating coherent harmonic movement based on tonal function. Common progressions like I–IV–V–I or vi–IV–I–V follow predictable functional patterns that guide listener expectation. Mastering diatonic progressions provides the foundation for all harmonic composition, from simple accompaniment to complex formal architecture.
Chart common diatonic progressions in multiple keys and use them as compositional templates. Analyze how classical composers use root-position progressions, stepwise bass lines, and functional harmony to create coherence.
You already know that diatonic chords are built from a single scale, and that each chord has a harmonic function — tonic (stability), predominant (motion away), or dominant (tension toward resolution). Diatonic harmonic progression is the art of arranging these chords in sequences that feel purposeful and coherent. The fundamental insight is that harmony moves by implication: each function creates an expectation about what comes next, and compositions gain power by meeting, delaying, or subverting those expectations.
The workhorse progressions in tonal music all trace a functional arc. I–IV–V–I moves from stability through predominant tension to dominant tension, then resolves home — a complete harmonic journey in four steps. The circle of fifths progression (e.g., iii–vi–ii–V–I) chains successive perfect-fifth descents in the bass, each chord resolving into the next like a series of small dominants. These patterns feel inevitable precisely because the functional expectations accumulate and resolve systematically. vi–IV–I–V (a common pop progression) works by the same logic in a different order, ending on a half cadence that leaves the listener leaning forward.
One of the key compositional decisions is bass-line management. When all chords are in root position, the bass leaps between roots and can feel heavy or choppy. Composers gain flexibility by choosing first-inversion chords to keep the bass moving stepwise — a smooth bass line creates direction and coherence even when the harmonies change. This is why you often see I–I6–IV in a Bach chorale: the I6 puts the third in the bass, allowing a stepwise descent from scale degree 1 to 3 to 4 without disrupting the harmonic logic above.
Longer progressions work by controlling how quickly and strongly the music moves toward or away from the tonic. A sequence of tonic chords (I, iii, vi) prolongs stability. A chain of predominants (IV, ii) builds momentum. A prolonged dominant (V, V7) creates maximum tension. The skill in composition is pacing this arc across the phrase — too quick a resolution feels rushed, too long on the dominant feels stalled. Think of the functional arc as breathing: inhale (tonic), move (predominant), tension (dominant), exhale (tonic). Each phrase is a breath, and controlling the length and shape of each phase is what gives a progression its character.
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