A chord progression is a sequence of chords played in order. A diatonic chord progression uses only the chords that belong to a single key — no borrowed chords, no modulation. Most of the songs you know and love are built from diatonic progressions.

The Building Blocks

In any major key, you have seven diatonic chords to work with (I through vii°). Each has a characteristic emotional weight:

  • I — stable, resolved, home
  • ii — gentle tension, often pre-dominant
  • iii — ambiguous, can lean major or minor
  • IV — warm, moving away from home
  • V — strong tension, wants to resolve to I
  • vi — melancholic, the "sad" chord of the key
  • vii° — highly unstable, resolves strongly to I

Common Progressions

I – IV – V – I

The most fundamental progression in Western music. In C major: C – F – G – C. The I to IV creates gentle movement; the V creates tension that resolves home to I. The 12-bar blues is essentially an expanded version of this.

I – V – vi – IV

The most ubiquitous progression in modern pop. In C major: C – G – Am – F. The shift to vi (Am) introduces a melancholic moment before the IV lifts it back. It loops endlessly because it ends on IV, which naturally wants to move back to I. Thousands of hit songs use this exact loop.

vi – IV – I – V

Same four chords as above, starting on vi. In C major: Am – F – C – G. Starting on the minor chord gives the whole thing a darker, more introspective feel — even though you're using the same chords.

I – vi – IV – V

The classic 50s doo-wop progression. In C major: C – Am – F – G. Has a nostalgic, circular quality. The voice leading is smooth — each chord shares notes with the next.

ii – V – I

The cornerstone of jazz harmony. In C major: Dm – G – C. The ii chord sets up the V, which resolves to I with maximum tension. Almost all jazz standards are built around variations of this movement.

How to Write Your Own

A few principles that help when building progressions from scratch:

  • Start and end on I to establish a clear tonal center, at least until you're comfortable breaking the rule.
  • V → I is your strongest move. Use it to create resolution at the end of a phrase or section.
  • Use IV or ii before V to build tension before the resolution (a "pre-dominant" chord).
  • vi adds emotional depth. Swapping I for vi, or ending a phrase on vi instead of I, creates a sense of longing or unfinished feeling.
  • Repeat and vary. A four-chord loop for a verse with a subtle change for the chorus (swap one chord, change the order) is often all you need.

Chord Substitution

Because chords that share notes have similar functions, you can substitute one for another to add color. The iii chord shares two notes with I and can substitute for it. The ii chord shares two notes with IV and can replace it. Swapping related chords adds variety without breaking the diatonic framework.

Moving to Minor Keys

The same logic applies in minor keys, but the diatonic chords are different. In a natural minor key, the chord built on the 5th degree is minor (v), not major (V) — which means less dominant pull. Composers often borrow the major V from harmonic minor to get that strong resolution. See minor scales for more on how this works.