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1-2-4-5 Chord Progression (I–ii–IV–V)

A country and folk staple that climbs stepwise from the tonic through the ii before opening to IV and V.

The Progression

Key of G major
Key
IiiIVV

Why It Works

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Questions about the I–ii–IV–V progression

What does the ii chord do in a country progression?

Am supplies a moment of minor colour without leaving the key, and it sets up the IV and V that follow. Because the ii sits a step above the tonic, moving to it feels like a small lean forward, a gentler way to leave home than jumping straight to the IV.

How is 1-2-4-5 different from 1-4-5?

It inserts the ii chord between the I and the IV. That extra chord turns a three-chord cadence into a four-chord loop, adds a bass note (A) to the walk, and gives the progression a touch of melancholy that plain 1-4-5 does not have.

Can I play the Am as Am7?

Yes. Am7 in open position is Am with the third string left open, and it fits G major just as well. Many players use it in this progression because the open G on top of the chord ties it to the tonic and makes the change from G smoother.

Related progressions & chords

I–IV–I–VCountryI–V–IVCountry GChordAmChordCChordDChord