Common chord progressions
Most songs run on a handful of chord patterns. Learn four of them and you can play, recognize and write an enormous amount of music. All examples are in C major — transpose them anywhere with the same Roman numerals.
Roman numerals: the portable notation
Number the notes of a scale 1 through 7 and build a chord on each: in C major that gives C(I), Dm(ii), Em(iii), F(IV), G(V), Am(vi), Bdim(vii°). Uppercase numerals are major chords, lowercase minor. A progression written in numerals works in every key — I–IV–V is C–F–G in C, but G–C–D in G.
I–V–vi–IV: the pop axis
C – G – Am – F. This four-chord loop underlies an absurd share of pop music — "Let It Be", "No Woman No Cry", "Someone Like You" and hundreds more. Start it on the vi (Am – F – C – G) and you get its melancholy twin, the basis of "Zombie" and countless ballads.
Practice it as a loop until the changes are automatic, then experiment with inversions to smooth the bass: C – G/B – Am – F walks the bass down four steps.
ii–V–I: the jazz cadence
Dm7 – G7 – Cmaj7. The ii sets up, the V pushes, the I resolves — three chords whose roots fall by fifths. Jazz standards chain ii–V–Is through different keys back to back, which is why jazz players drill this pattern in all twelve keys.
Even outside jazz it is everywhere: the pre-chorus lift in countless pop songs is a ii–V doing its job.
The 12-bar blues
Three chords, twelve bars: four bars of I7, two of IV7, two of I7, then V7 – IV7 – I7 – V7. In C: C7, F7 and G7. It is the shared vocabulary of blues, early rock and roll, and jam sessions everywhere — if you can play a 12-bar in C, F and G, you can sit in almost anywhere.
Descending bass: the ballad move
C – G/B – Am – Am/G – F – C/E – Dm7 – G. The chords are ordinary, but the bass walks down the scale one step per chord, and suddenly it sounds like a classic ballad. This is inversions earning their keep — the same trick powers "A Whiter Shade of Pale" and "Piano Man".
How to practice progressions
Loop one progression for five minutes a day: left hand plays roots, right hand plays chords, then swap duties. Say the numerals out loud as you play. Once C major feels automatic, move the same numerals to G major, then F major. The circle of fifths tool on this site shows you each key's chords at a glance.
Keep exploring
Frequently asked questions
What is the most common chord progression?
I–V–vi–IV (C–G–Am–F in C major) and its rotation vi–IV–I–V are the most used progressions in modern pop music.
What do Roman numerals in chord progressions mean?
The scale degree the chord is built on: I is the chord on the first note of the key, V on the fifth. Uppercase means major, lowercase minor. They make progressions key-independent.
How do I transpose a progression to another key?
Keep the numerals, change the scale. I–V–vi–IV in C is C–G–Am–F; in G major the same numerals give G–D–Em–C.
How many progressions do I need to learn?
Four cover most situations: I–V–vi–IV, ii–V–I, the 12-bar blues, and a descending-bass line. Learn each in two or three keys before adding more.
