Quartal Harmony · Jazz Wiki

Quartal harmony builds chords out of stacked perfect fourths instead of the stacked thirds of tertian harmony. Strip out the third and you strip out the thing that tells your ear whether a chord is major or minor — what’s left is an open, ambiguous sonority that floats rather than resolves. That ambiguity is the whole point: it gave jazz musicians a harmonic language for music that doesn’t want to move anywhere.

Why fourths sound different from thirds

A triad built from thirds (C–E–G) locks in a major or minor identity the instant you hear it, because the third is the interval that carries that information. A triad built from fourths (C–F–B♭) has no third anywhere in it, so it carries no major/minor quality at all — just a pure, hollow color. This is also why quartal stacks are close cousins of suspended chords: a sus chord temporarily swaps the third for a 2nd or 4th and implies resolution back to it, while a quartal voicing stacks pure fourths as a stable endpoint with nothing to resolve. Because the ear can’t fix a single “root” among the stacked notes, any note in the stack can act as the bass — C–F–B♭ over a C bass reads as a C7sus4 sound (root, 4th, ♭7th), over an F bass as Fsus4 (root, 4th, 5th), over a B♭ bass as a B♭sus2 color (root, 9th, 5th).

Thirds lock in a quality

The major third at the bottom announces the chord's identity the instant you hear it — thirds carry the major/minor information

Fourths erase it

B♭b7

No third anywhere in the stack — a pure, hollow color that reads as C7sus4, Fsus4, or B♭sus2 depending on which note the bass claims

Where it came from: modal jazz needed a harmony without function

Quartal harmony rose to prominence with modal jazz in the early 1960s precisely because functional harmony — chords that pull toward resolution via tritone-driven dominant motion — was exactly what modal writing wanted to escape. When a tune sits on one scale for eight or sixteen bars, you don’t want chords announcing “resolve me”; you want color that can just sit there. Fourths, lacking the third that drives functional pull, do that job. Miles Davis’s So What is the founding document: Bill Evans’s “So What” voicing stacks three perfect fourths topped with a major third — E–A–D–G–B over a D bass — spelling out D9–11–13 with no literal 3rd or 7th present, yet it reads unmistakably as a rich D Dorian sonority.

Here is that stack on the page — the same E–A–D–G–B built in fourths above a D bass:

The sound in practice: stacks, sus chords, and pentatonics

Quartal harmony rarely throws out tertian information entirely — in practice, players layer fourths on top of a root, 3rd, and 7th rather than replacing them, which is how you get extended, ambiguous-sounding chords that still function as recognizable extensions of a ii, V, or I. A few things to notice by ear and on the page:

Fourth stacks generate sus2/sus4 sonorities automatically: G–C–F reads as Csus4 or as Fsus2 depending on context.
Pentatonic scales sit naturally inside quartal harmony — over Dm7, C major pentatonic (C–D–E–G–A, the same notes as A minor pentatonic) is fully consonant, and its five notes can be restacked entirely in fourths: E–A–D–G–C.
Rotating a fourth stack doesn’t change its color much: D–G–C, G–C–D, and C–D–G are all the same open sound in different arrangements, which is part of why quartal harmony blends so easily with cluster voicings.

From color to vocabulary: Tyner, Evans, and Hancock

McCoy Tyner turned quartal stacks into a full two-handed comping vocabulary in the Coltrane Quartet (1960–66), building dense, open block chords in fourths that avoid any voice-leading toward a tonic the way ii–V–I chords do. Herbie Hancock’s Maiden Voyage pushes the idea into composition itself: the tune’s chords are quartal-voiced minor sevenths moving over a bass line built from fifths, so the whole piece feels suspended in air rather than progressing through changes. For the hands-on mechanics of building and voicing these chords at the keyboard or on guitar, see Quartal Voicings — a related, more technique-focused voicing approach.

♫ Listen

Miles Davis — “So What” (Kind of Blue, 1959): Bill Evans’s five-note quartal voicing (E–A–D–G–B) answers the bass call in the head and returns throughout the comping — the single most-copied quartal sound in jazz.
Herbie Hancock — “Maiden Voyage” (Maiden Voyage, 1965): the entire form is built from quartal-voiced minor sevenths over a shifting fifths-based bass; listen for how static and open the harmony feels even as the bass moves.
McCoy Tyner — “Passion Dance” (The Real McCoy, 1967): Tyner’s left-hand fourths and right-hand block chords create a searching, unresolved color with none of the pull of a traditional ii–V–I.