ii–V–I in Major & Minor
Same three-chord skeleton, two very different moods — one bright and settled, one dark and unresolved.
The major version: iim7–V7–Imaj7
In C major, this is Dm7 – G7 – Cmaj7. The ii chord (minor 7) sets up the V chord (dominant 7), which resolves to the I chord (major 7). Roots fall by a perfect fifth at each step, giving the strongest, most gravity-driven motion available in tonal harmony.
The minor version: iim7♭5–V7(alt)–im
In C minor, the equivalent motion is Dm7♭5 – G7(alt) – Cm. Two things change from the major version: the ii chord becomes half-diminished (m7♭5), and the V chord is frequently altered — its 9th and/or 13th raised or lowered a half step for extra tension. The tonic itself is often voiced as Cm6 or Cm(maj7) rather than a plain minor triad, since a bare minor 7 chord (Cm7) can feel harmonically ambiguous as a true resting point.
Why the ii chord is half-diminished in minor
This isn't a special substitution — it's just diatonic fact. Stack thirds on the 2nd degree of any natural minor scale (D, in C minor: D–F–A–C) and you get a diminished triad (D–F–A♭ in harmonic-minor-flavored contexts, or D-F-A in natural minor, still a diminished 5th between D and A♭/A depending on the exact minor form used) with a minor 7th on top — that combination is precisely a half-diminished chord. The half-diminished ii is simply what naturally occurs when a minor key builds its own chords.
Why the V chord gets altered
Minor keys commonly borrow the raised 7th degree from harmonic minor to create a leading tone into the tonic. That raised 7th becomes the 3rd of the V chord, and the rest of harmonic minor's odd interval structure naturally produces altered tensions (like ♭9 and ♯9) above the dominant root — which is why minor ii-V-i so often resolves through a fully altered dominant chord.
Common questions
What is the minor key version of ii-V-I?
iim7b5 - V7(alt) - im, for example Dm7b5 - G7alt - Cm. The tonic is often played as a minor 6 or minor(major7) chord rather than a plain minor triad.
Why is the ii chord half-diminished in minor keys?
Stacking thirds on the 2nd degree of a minor scale naturally produces a diminished triad, and adding the minor 7th on top makes it a half-diminished (m7b5) chord — it's diatonically correct, not a substitution.
Why is the V7 chord often altered in minor ii-V-i?
Harmonic minor raises the 7th degree to create a leading tone, which changes the V chord's upper structure and makes altered tensions like b9 and #9 fit naturally, giving minor ii-V-i its distinctive darker pull to the tonic.
How do major and minor ii-V-I differ in feel?
Major ii-V-I (Dm7-G7-Cmaj7) feels bright and resolved. Minor ii-V-i (Dm7b5-G7alt-Cm) feels darker and more tense, both because of the half-diminished ii chord and the altered dominant.
Practice both versions in every key
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