Beginner Chord Progressions

Roman numerals and diatonic chords

Every major key contains seven chords, one built on each note of the scale. We number them with Roman numerals, using uppercase for major chords and lowercase for minor:

• I — major (the tonic, "home")
• ii — minor
• iii — minor
• IV — major
• V — major (the dominant, "tension")
• vi — minor (the relative minor)
• vii° — diminished

In the key of C major those chords are C, Dm, Em, F, G, Am, and B°. The power of Roman numerals is that they describe the relationship between chords, not specific notes — so a "I–IV–V" means C–F–G in C, but G–C–D in G. You can transpose any progression to any key just by reading the numbers off the new scale. See the full set of chords in a key with the diatonic chords tool.

I–IV–V — the three-chord backbone

The I, IV, and V chords are the three major chords in a key, and together they can harmonise almost any simple melody. This is the engine of folk, country, punk, and early rock and roll.

In C major: C – F – G. In G major: G – C – D. The V chord creates tension that pulls strongly back to the I, which is why these three chords feel so complete on their own. Countless campfire songs never use anything else.

I–V–vi–IV — the "four-chord song"

Add the relative minor (vi) and you get the most famous pop progression of the last few decades: I–V–vi–IV. In C that is C – G – Am – F.

This loop has powered a huge number of hit songs across pop and rock. Its appeal is the mix of three bright major chords with one wistful minor chord, which gives it an instantly singable, emotional pull. Its cousin, vi–IV–I–V (Am–F–C–G in C), is the same four chords starting on the minor for a more melancholy feel.

ii–V–I — the jazz cadence

The ii–V–I is the most important progression in jazz and shows up constantly in pop too. In C: Dm – G – C. Jazz players usually make them seventh chords — Dm7 – G7 – Cmaj7 — to get a richer, smoother voice-leading sound.

It works because the ii sets up the V, and the V resolves powerfully to the I. Stringing several ii–V–I moves together is how jazz standards modulate through different keys. If you want to read and write progressions like a session player, the Nashville Number System uses the same idea with Arabic numbers.

The 12-bar blues

The 12-bar blues is a fixed 12-measure form built from the I, IV, and V chords — usually as dominant 7th chords. A standard pattern in A is:

• Bars 1–4: A7 (I)
• Bars 5–6: D7 (IV)
• Bars 7–8: A7 (I)
• Bar 9: E7 (V)
• Bar 10: D7 (IV)
• Bars 11–12: A7 then E7 (the turnaround)

This single form is the basis of countless blues, rock, and early R&B songs. It pairs perfectly with the scales in the best scales for blues guide, so loop a 12-bar and practise soloing over it.

Tips for using progressions

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