If jazz harmony were a language, the ii-V-I would be its most common sentence. It appears in virtually every jazz standard ever written. It is the first progression taught in every jazz programme. It is the sequence that separates musicians who can play jazz from musicians who can play over jazz changes. If you master the ii-V-I in all 12 keys — truly master it, so that your fingers and ears know it as intimately as your native language — you have the key to the entire repertoire.

To see the chords in every key at a glance, open our free ii-V-I Progression Generator. It will show you every major and minor ii-V-I, arranged chromatically, through the circle of fourths, or in random order for sight-reading practice.

What Is the ii-V-I?

The ii-V-I is a three-chord progression built on the second, fifth, and first degrees of a major (or minor) scale. In the key of C major:

• ii = Dm7 (D minor 7th, built on the 2nd degree)
• V = G7 (G dominant 7th, built on the 5th degree)
• I = Cmaj7 (C major 7th, built on the 1st degree)

The magic lies in the harmonic function of each chord. The ii chord introduces gentle tension. The V7 chord intensifies that tension with a tritone interval (B–F in the case of G7) that creates a powerful gravitational pull. The I chord resolves everything, providing a sense of arrival and rest. This arc — tension, heightened tension, resolution — is the engine that drives jazz harmony.

The Minor ii-V-i

In minor keys, the progression takes a darker form. In C minor:

• ii = Dm7b5 (D half-diminished — the b5 gives it a haunting quality)
• V = G7alt (G altered dominant — with b9, #9, and/or b13 for maximum tension)
• i = Cm(maj7) (C minor with a major 7th, or sometimes Cm7)

The minor ii-V-i is emotionally intense and technically demanding. The half-diminished chord requires different voicings and scales than its major counterpart (Locrian or Locrian #2 rather than Dorian), and the altered dominant demands comfort with the Altered scale or harmonic minor. Practise both major and minor ii-V-I progressions from the start — our ii-V-I Generator lets you toggle between them.

Practice Strategy: The Circle of Fourths

The single most effective practice method is to work through ii-V-I progressions in the circle of fourths: C, F, Bb, Eb, Ab, Db, Gb, B, E, A, D, G. This order is not arbitrary — it mirrors the most common key changes in the jazz repertoire. Standards like 'All the Things You Are' and 'Autumn Leaves' move through keys in fourths, so practising in this order prepares you for real musical situations.

Start at a slow tempo — 60 BPM is fine. Play the voicings for each ii-V-I, holding each chord for two beats, and move smoothly to the next key. Focus on voice leading: keep common tones, move other notes by the smallest possible interval. Use our BPM Tap Tool to set your metronome, and increase the tempo by 5 BPM only when the current tempo feels completely effortless.

Scales for the ii-V-I

Knowing which scales to play over each chord is essential for improvisation. The standard scale choices are:

• Over ii (Dm7): D Dorian — the default, always-correct choice
• Over V (G7): G Mixolydian (consonant) or G Altered (tense, resolving)
• Over I (Cmaj7): C Ionian (stable) or C Lydian (floating, modern)

For a deeper dive into scale choices, our Jazz Scale Finder shows you every scale that fits over each chord type, rated by how well it works (Primary, Safe, or Advanced) with explanations of why.

Hearing the ii-V-I in Standards

Once you can play ii-V-I progressions in every key, start listening for them in real tunes. Put on a recording of 'Autumn Leaves' and follow the chord chart — you will hear ii-V-I after ii-V-I, in both major and minor keys. Then try 'All the Things You Are,' which chains ii-V-I progressions through four different key centres. Suddenly, a tune that seemed impossibly complex reveals itself as a series of familiar patterns.

This is the real payoff of mastering the ii-V-I. It does not just give you a practice exercise — it gives you a lens through which the entire jazz repertoire becomes intelligible. And that is the difference between learning tunes one at a time and understanding the language that connects them all.

If you need to transpose any chord progression to a different key for your instrument, our Jazz Key Transposer lets you do it instantly — just enter the chords and select your target key.