Pop axis

General info

Progression

Pop axis

Pattern

I – V – vi – IV

Type

Major

Mode

major

Genre

Pop / rock

Chord count

4

Brief character

I–V–vi–IV: a repeating four-chord loop common in pop and rock

Progression composition

Construction logic

The I – V – vi – IV progression alternates the major pillars I, V, and IV with minor vi. The final subdominant IV returns readily to tonic, creating an even loop often used as the harmonic basis of a verse or chorus in pop and rock.

How it sounds

Character

Major functional progression

Perceptual context

Depends on melody, rhythm, tempo, register, and texture

Stability

Medium — cyclical structure

Completeness

Cyclic — closure emerges at the repeat

Harmonic functions

Tonic establishes a stable centre, predominant prepares dominant, and dominant directs the motion back toward tonic.

Tensions & resolutions

Dominant V moves to vi instead of tonic, creating deceptive motion. Predominant IV then returns the loop to I. Functional scheme: tonic I → dominant V → tonic substitute vi → predominant IV → tonic I.

Harmonic context

Diatonic chords, scales, modes and cadences in the selected key:

The progression transposes to any key — the structure (degrees) stays the same, only the specific chords change.

Variability

• Replace I → Imaj7 or I6 for a softer sound
• Replace V → V7 for more tension
• Replace vi → vi7 for a jazzy touch
• Simplification: I – V – vi – IV → I – V – IV (drop vi)
• Extension: I – V – vi – IV → I – V – vi – IV – ii – V