Minor Seventh · Theory

Seventh Chord Minor Triad Dominant Seventh Major Seventh Half-Diminished Seventh Scales and Harmony

A minor seventh is a minor triad plus a minor seventh:

C minor seventh = C–E♭–G–B♭

It is the gentlest of the four common seventh chords — because it pairs two already-dark elements (a minor third and a minor seventh) and contains no sharp internal clash.

It is the most common one

Stack thirds by scale degree:

Scale	Degrees that produce a minor seventh naturally
major	degrees 2, 3 and 6 (ii7, iii7, vi7) — three of them
natural minor	degrees 1, 4 and 5 (i7, iv7, v7) — three of them

Compare the neighbours:

major seventh: only 2 in a major scale (degrees 1 and 4)
half-diminished: only 1 (degree 7)

The minor seventh is the most plentiful, and therefore the most frequent in practice. In jazz the basic progression is ii7–V7–Imaj7, where two of the three chords are seventh chords.

What the seventh does

Chord	Seventh	Treatment
dominant seventh	minor seventh	resolves downward (it is a leading tone)
minor seventh	minor seventh	usually held or moved smoothly, no forced resolution

Note the second row: the same minor seventh must resolve in a dominant chord and may simply stay in a minor one. The difference comes from the foundation — a dominant seventh contains a tritone (push), a minor seventh does not (rest). So the seventh's role is decided by the whole chord, not by the interval alone.

Diagram: the rest-to-push spectrum

Listen: the minor seventh

Hear how it differs from the dominant seventh — the same minor seventh, but without a tritone the push is visibly weaker.

Common misconceptions

"The word minor makes it dissonant." It is the gentlest of the four, precisely because it has no tritone.
"Every minor seventh must resolve." It must in a dominant seventh, usually not in a minor seventh. The seventh's role depends on the whole chord.
"A minor seventh is derived from a minor triad." More accurately, it — like the others — arises from stacking thirds on a scale.
"More complex chords are more unstable." Instability comes from specific intervals (especially the tritone), not from the number of notes. Ninths and thirteenths can be perfectly stable.

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Listen in the library

Scales, Arpeggios, and CadencesC13:22Scale exercises can sound a minor-seventh arpeggio, comparing the same seventh degree at different heightsDetailsSonata in A Minor, K.175C13:50A sonata in A minor — the minor seventh on degree 4 acts as a subdominant, its push soft rather than sharpDetails27. Greensleeves to a Ground with DivisionC10:24Greensleeves to a Ground — minor-seventh chords recur throughout, their natural habitatDetails

All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).

Sources

小七和弦 = 小三和弦 + 小七度，属和声学通则
小七和弦在大调 ii / iii / vi 级与小调 i / iv / v 级上自然产生，为通行和声学表述

Used for fact-checking only; all prose is original.

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