# Chord Progressions for Guitar: The Patterns Behind Every Song
> How chord progressions work on guitar — Roman numerals, the diatonic chords of every key, the classic patterns (I-V-vi-IV, ii-V-I, 12-bar blues) and how to write your own.
A chord progression is the road a song travels. Learn to read the road signs —
the Roman numerals — and you stop memorising thousands of songs individually.
You start recognising the same dozen journeys underneath all of them.

## The seven chords of a key

Every major key owns exactly seven chords, built by stacking every other note
of its scale. In C major (notes C D E F G A B):

| Numeral | Chord | Role |
| --- | --- | --- |
| I | C | Home — where progressions start and end |
| ii | Dm | Gentle movement away from home |
| iii | Em | A softer, sadder colour |
| IV | F | The "away" chord — lift and openness |
| V | G | Tension that pulls back home |
| vi | Am | The relative minor — home's moodier twin |
| vii° | Bdim | Restless, rarely lingered on |

Change key and the letters change, but the roles don't. That is the entire
trick: **learn the roles once, play them in every key.** The
[circle of fifths](/tools/circle-of-fifths) shows this table for all twelve
keys on one wheel.

Here is the same table in the keys you will actually play in:

| Key | I | ii | iii | IV | V | vi | vii° |
| --- | --- | --- | --- | --- | --- | --- | --- |
| C | C | Dm | Em | F | G | Am | Bdim |
| G | G | Am | Bm | C | D | Em | F#dim |
| D | D | Em | F#m | G | A | Bm | C#dim |
| A | A | Bm | C#m | D | E | F#m | G#dim |
| E | E | F#m | G#m | A | B | C#m | D#dim |
| F | F | Gm | Am | Bb | C | Dm | Edim |
| Bb | Bb | Cm | Dm | Eb | F | Gm | Adim |
| Eb | Eb | Fm | Gm | Ab | Bb | Cm | Ddim |

Two of those seven chords are the ones players avoid because they have never
been shown the shapes: the vii° is a [diminished chord](/chords/diminished-chords)
and the raised third of a minor key is an [augmented chord](/chords/augmented-chords) —
both are collected with every root on one page. If you would rather see where
a progression's chords come from note by note, the
[chord builder](/tools/chord-builder) works backwards from the intervals.

## The classic patterns

### I–V–vi–IV — the pop axis

C – G – Am – F. From Journey to Taylor Swift, this loop is the most-used
progression in modern pop. Home, tension, melancholy, lift — all four emotional
stations in four chords.

### I–IV–V — the three-chord trick

C – F – G. Folk, country, early rock and a thousand campfire songs. If you can
play these three chords in a few keys, you can play along with most of the
20th century.

### I–vi–IV–V — the doo-wop loop

C – Am – F – G. The sound of 1950s slow dances, still alive wherever a song
wants instant nostalgia.

### ii–V–I — the jazz turnaround

Dm – G – C. The engine of jazz standards: approach, tension, resolution. Once
you can hear ii–V–I, you start hearing it everywhere.

### i–VII–VI–VII — the Andalusian walk

Am – G – F – G. The flamenco-flavoured minor descent — dark, circular,
hypnotic. Hear it in everything from classical guitar to metal.

### The 12-bar blues

Twelve bars of I, IV and V (usually as dominant 7th chords: C7, F7, G7). It is
a fixed form rather than a pattern — learn the shape once and blues, rock and
roll, and half of early pop opens up.

## How to find the key of a song

Before you can name a progression you need its key, and the key is usually
sitting in plain sight. Four steps, in order:

1. **Play the last chord.** Songs overwhelmingly end on the tonic, so the final chord is your first and best guess at the key.
2. **List every chord in the song.** Not just the verse — the chorus and bridge too, because borrowed chords show up there.
3. **Match the set against the key table above.** The key whose seven chords contain all of them is the one. If one chord does not fit, you are probably looking at a borrowed chord or a mode.
4. **Check the first chord.** It is usually the tonic or the vi, so it breaks ties.

Worked example: [Knockin' on Heaven's Door](/songs/knockin-on-heavens-door-chords)
uses G, D, Am and C and ends on G. All four sit inside G major (I, V, ii, IV),
and the song starts on G. Key of G, progression I–V–ii–IV. Three steps, about
thirty seconds. The [key finder](/tools/key-finder) does the same job
interactively if you would rather click than reason.

## A songbook decoded

The fastest way to internalise numerals is to read songs you already know as
numbers instead of letters. Every row below is a song charted on this site:

| Song | Key | Chords | As numerals |
| --- | --- | --- | --- |
| [Three Little Birds](/songs/three-little-birds-chords) | A | A, D, E | I–IV–V |
| [Knockin' on Heaven's Door](/songs/knockin-on-heavens-door-chords) | G | G, D, Am, C | I–V–ii–IV |
| [Country Roads](/songs/country-roads-chords) | G | G, Em, D, C | I–vi–V–IV |
| [Stand By Me](/songs/stand-by-me-chords) | G | G, Em, C, D | I–vi–IV–V |
| [Hallelujah](/songs/hallelujah-chords) | C | C, Am, F, G | I–vi–IV–V |
| [Let It Be](/songs/let-it-be-chords) | C | C, G, Am, F, Em, Dm | I–V–vi–IV–iii–ii |
| [Wagon Wheel](/songs/wagon-wheel-chords) | G | G, D, Em, C | I–V–vi–IV |
| [Take It Easy](/songs/take-it-easy-chords) | G | G, D, C, Em, Am, G7 | I–V–IV–vi–ii–I7 |
| [Zombie](/songs/zombie-chords) | Em | Em, C, G, D | i–VI–III–VII |
| [Wonderwall](/songs/wonderwall-chords) | Em | Em7, G, Dsus4, A7sus4 | i–III–VII–IV (Dorian) |

Two rows in that table are worth pausing on. Zombie uses exactly the same four
chord shapes as a I–V–vi–IV pop song, rotated, but because the loop starts on a
minor chord the whole song reads as minor. And Wonderwall's fourth chord is a
major IV in a minor key, which is Dorian rather than the natural minor the
other three chords imply — that one borrowed note is why the song sounds
neither happy nor sad.

## How to write your own progression

1. **Start and end on the tonic.** I in major, i in minor. A loop that comes
   home feels finished.
2. **Put tension before home.** V (or vii°) right before the final I is the
   oldest trick in the book because it works every time.
3. **Let the middle wander.** ii, iii, IV and vi are your colours — vi adds
   sadness, IV adds lift, ii and iii add motion.
4. **Keep it short.** Three or four chords, looped, is a song. Eight chords is
   a lecture.

Try every pattern above in any key with the
[chord progression generator](/tools/chord-progression-generator) — hear it
strummed before your fingers learn it, then transpose until it fits your voice.

## Why some progressions sound wrong

| Symptom | Likely cause | Fix |
| --- | --- | --- |
| The loop never feels finished | It does not return to the tonic | End on I, or put V immediately before the I |
| Two chords clash | They come from different keys | Check both against the key table above |
| It sounds like a nursery rhyme | Only I, IV and V, no tension in the middle | Swap one for vi or ii |
| It sounds aimless | Too many chords, no home base | Cut to four and loop |

## Hearing progressions in real songs

The fastest way to internalise these patterns is to spot them in songs you
already love:

- [Let It Be](/songs/let-it-be-chords) — I–V–vi–IV in C, as canonical as it gets
- [Three Little Birds](/songs/three-little-birds-chords) — I–IV–V, three chords, endless joy
- [Wonderwall](/songs/wonderwall-chords) — a minor-key loop held together by two anchored fingers
- [Hotel California](/songs/hotel-california-chords) — an eight-chord minor descent, the exception that proves the "keep it short" rule by being unforgettable anyway
- [Sweet Home Alabama](/songs/sweet-home-alabama-chords) — D, C, G, F, which is not a diatonic set at all and is still one of the most recognisable loops ever recorded

Spot the numerals in five songs and you will never hear music the same way
again. If you want to test yourself, open any song sheet on this site, cover
the chord names, and name the numeral instead of the chord.
## FAQ
### What are the most common chord progressions?
I–V–vi–IV (C–G–Am–F) powers thousands of pop hits. I–IV–V is the backbone of rock and folk. I–vi–IV–V is the 50s doo-wop loop, ii–V–I defines jazz, and the 12-bar blues is its own fixed form. Learn these five and you can play most of the popular songbook.
### What do Roman numerals mean in chord progressions?
Numerals name chords by their position in the key, not by letter. In C major, I = C, IV = F, V = G. The same numerals in G major mean G, C, D — so a progression learned once as numerals works in every key. Uppercase is major, lowercase is minor.
### How many chords do I need to write a song?
Two is enough for a groove, three or four is the sweet spot. Most hit songs loop a single four-chord progression for verses and chorus alike — what changes is the melody, rhythm and arrangement on top.
### Why do some chord changes sound natural and others jarring?
Chords that share notes move smoothly — C and Am share two of their three notes. Chords adjacent on the circle of fifths differ by only one note, which is why V to I feels like coming home. Jarring changes simply share fewer notes; sometimes that surprise is exactly what a song wants.
### How do I find the key of a song?
Play the last chord of the song first — it is almost always the tonic. Then list every chord that appears and match the set against the seven chords of each key. The key whose seven chords contain all of them is your answer.
### Can two songs use the same chords and still sound different?
Yes, and they usually do. A progression is a skeleton; tempo, strumming, melody, dynamics and arrangement are the song. Hundreds of recorded hits share the exact I–V–vi–IV loop and sound nothing alike.
Canonical page: https://openguitarchords.com/guides/chord-progressions