Four chords, one key, roughly a third of the radio. If you already read my full guide on how to write your own pop song →, you saw the same four chords — the 1st, 6th, 4th and 5th steps of the key — showing up again and again, just shuffled into a different order each time. This is the cheat-sheet version: what those four chords are called when they get famous, and how to hear the pattern in ten seconds flat.
Meet the "Axis progression"
Take the I, V, vi and IV chords of any major key — in C major that's C, G, Am and F — and play them in that order, on a loop. Music theorists and Wikipedia call this the I–V–vi–IV progression, nicknamed the "Axis progression" after the Australian comedy band Axis of Awesome, whose 2009 medley strung together dozens of hits built on exactly these four chords, in exactly this order, to make the point that pop music recycles its harmony more than anyone wants to admit.
The same four chords, started somewhere else in the loop, get their own names too: rotate to vi–IV–I–V (Am–F–C–G) and you've got what a Boston Globe columnist dubbed the "sensitive female chord progression" after noticing it under a wave of late-90s singer-songwriter ballads. Rotate to I–vi–IV–V (C–Am–F–G) and you're in doo-wop territory — musicians call it the "'50s progression", the same changes under "Stand by Me" and a wave of early-60s doo-wop hits. Same four notes' worth of harmony, different door to walk through it.
| Rotation | In C major | Known as |
|---|---|---|
| I–V–vi–IV | C–G–Am–F | the “Axis progression” |
| vi–IV–I–V | Am–F–C–G | the “sensitive female chord progression” |
| I–vi–IV–V | C–Am–F–G | the “’50s progression” (doo-wop) |
Why it works instead of getting boring
Only one chord in the loop is the dominant (V), and it never gets its "proper" resolution straight back to I — by the time it arrives, the phrase has usually already looped past. That's what keeps four chords from feeling like four chords: the ear gets the pull of tension and release, minus the hard stop, so the progression can circle forever under a verse, a chorus and a bridge without ever sounding "finished". It's also why the same four chords carry the deceptively different builds of the songs I list in the full pop-song guide — the steps are identical, the order and the rhythm on top are what make each song feel like its own thing.
Try it in 60 seconds
- Pick a major key and find its I, IV, V and vi chords (in C: C, F, G, Am).
- Loop them in any order — I–V–vi–IV, I–vi–IV–V, vi–IV–I–V are all proven, road-tested rotations.
- Keep the order fixed for at least one full verse before you touch it, or your listener's ear never locks onto the pattern in the first place.
Want the complete walkthrough — the full chord table, the actual song-by-song step analysis, and how to build a verse/chorus/bridge structure on top? Go read how do I write my own pop song? →, and once you've got chords picked, which chords go together covers the rest of the diatonic palette beyond these four.
If this saved you a Google rabbit hole at 1am, you can throw a coffee my way on Patreon — no pressure, purely for the riffs.