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The problem it solves
You need the strongest and smoothest cadential cell to prepare and confirm a key: the formula that underpins almost all of jazz and much tonal music.
Detailed theory
Key idea
It chains the functions subdominant (ii) → dominant (V) → tonic (I).
The roots move down by fifths (D → G → C), giving a very strong and smooth harmonic motion.
Understand it
The progression uses three degrees of the key: the second (ii, a minor chord that acts as a subdominant), the fifth (V, the dominant) and the first (I, the tonic). In C major they are D minor, G major and C major.
The ii prepares and reinforces the subdominant function before the dominant: it does not jump straight to the tension but reaches it with momentum. Then the V builds tension and the I resolves it. In Roman numerals: ii → V → I; in C major: Dm → G → C.
What makes the progression so solid is the motion of the roots: they move down by fifths. From D to G there is a fifth down, and from G to C another fifth down (D → G → C). This chain of fifths is the strongest and smoothest harmonic voice-leading there is.
In jazz it usually appears with sevenths: Dm7 – G7 – C (often Cmaj7). The sevenths add notes that resolve by step from one chord to the next, making the link sound even more connected. That is why the ii–V–I is the cornerstone of the jazz repertoire.
An analogy: it is like taking a run-up before jumping. The ii is the run gathering momentum, the V is the jump in the air (the maximum tension) and the I is the clean, stable landing.
Tension curve
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The tension curve of ii–V–I: the subdominant (ii) prepares, the dominant (V) builds the maximum tension and the tonic (I) resolves it into rest.
How to recognise it
How it's written
It is written with Roman numerals: ii – V – I. The ii is written in lowercase because it is a minor chord; the V and the I in uppercase. In jazz they are often marked with sevenths: iim7 – V7 – Imaj7.
How it feels
Follow the motion directed toward rest: the first chord prepares, the second tenses and the third resolves. The descent of the roots by fifths makes everything sound aimed at the tonic.
Common mistake
Confusing the ii (minor subdominant) with a tonic chord: its function is to prepare the dominant, not to rest.
Thinking the ii–V–I only exists with sevenths: the triad version (Dm – G – C) is already a ii–V–I; the sevenths are a typical jazz enrichment.
Try it
Play D minor – G major – C major and notice how the ii gathers momentum toward the dominant and it resolves to the tonic.
Add sevenths (Dm7 – G7 – Cmaj7) and compare: the link sounds more connected thanks to the notes that resolve by step.
On the instrument
Chord progression
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The ii–V–I progression in C major: D minor (ii, subdominant) – G major (V, dominant) – C major (I, tonic). The roots move down by fifths: D → G → C.
Where it's used
- Playing and accompanying jazz
- Mastering the basic cadential cell that structures almost all of the jazz repertoire.
- Preparing and confirming the key
- Using the ii to drive the dominant and close strongly on the tonic.
- Chaining chords by fifths
- Taking advantage of the descent of roots (D → G → C) for a strong, smooth harmonic motion.
Examples
Chord progression
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The jazz ii–V–I with sevenths: Dm7 – G7 – Cmaj7 in C major. The sevenths add notes that resolve by step and link the chords.
Exercises
Recognise the ii–V–I progression
Listen and identify the ii–V–I progression among other options.
Complete 6 attempts · 70% accuracy to pass
Mini test
Check that you've got it.
0/9 answeredQuestion 1/9
Which tonal functions does the ii–V–I progression chain?