Chromatic Mediants · Jazz Wiki

A chromatic mediant is a chord a third away from where you’d expect, that still somehow sounds like it belongs. Move the root by a major or minor third, keep the chord quality the same (major stays major, minor stays minor), and you land outside the diatonic key — yet one note holds over as a common tone, so the ear accepts the jump instead of hearing an error. That tension between “this shouldn’t work” and “this note connects it” is the entire appeal, and it’s why chromatic mediants read as color rather than function.

The Sound: Smooth Connection, Chromatic Surprise

Ordinary root motion in tonal music moves by fifth or step, and those moves resolve tension in predictable ways. Chromatic mediants sidestep that logic: instead of resolving, they simply relocate the tonal center by a third while a shared tone acts as the glue. This is why they feel like a lateral step rather than an arrival — a shift in scenery, not a cadence. It’s a variety of borrowed color, and in practice jazz players treat it as a substitution tool rather than a rule about voice leading.

Diatonic vs. Chromatic: Same Interval, Different Animal

Not every chord a third away counts as chromatic. In C major, moving from C to E minor or A minor is a diatonic mediant move — both chords live inside the key, the triads share two common tones, and the quality changes (major to minor). A chromatic mediant shares only one common tone, keeps the same chord quality, and steps outside the diatonic set entirely.

From C major (C–E–G), the four chromatic mediants are:

Chord	Root Motion from C	Common Tone
E♭ major (E♭–G–B♭)	up a minor third	G
E major (E–G♯–B)	up a major third	E
A♭ major (A♭–C–E♭)	down a major third	C
A major (A–C♯–E)	down a minor third	E

Add sevenths and a second shared tone sometimes appears (Cmaj7 and A♭maj7 hold both C and G in common), but the principle stays the same: one or two shared pitches gluing together two chords that officially have nothing to do with each other.

C and its four chromatic mediant roots — E♭, E, A♭, and A — each a major or minor third from home, each gluing itself to the C major triad through a single common tone

Here is Cmaj7 stepping to each of its four chromatic mediants in turn, with the shared tone held in the chord:

Notice the pattern: third-related roots, matching quality, one shared pitch class doing the work of connection.

Coltrane’s Cycle and the Standards That Predicted It

John Coltrane took chromatic mediants and turned them into a compositional engine. Giant Steps cycles three key centers a major third apart — B, G, and E♭ — each announced by its own dominant seventh:

Bmaj7 - D7 - Gmaj7 - B♭7 - E♭maj7 - F#7 - Bmaj7

The same cycle notated, each root a major third from the last:

This became the template for what’s now called Coltrane Changes: a way of inserting rapid third-related key shifts into a ii–V–I framework. Remarkably, the bridge of Have You Met Miss Jones (1937) already drops from B♭ major down a major third to G♭, down another to D, then back to G♭ — three key centers slicing the octave into equal major thirds, decades before Coltrane systematized the idea. This is one reason theorists point to that bridge as an unofficial blueprint for the entire Coltrane-changes vocabulary.

Using Them as a Reharmonization Tool

Because the common tone does the connecting, chromatic mediants make excellent substitution and reharmonization devices. One blunt but effective approach: rather than substituting chord for chord, recolor a stretch of diatonic changes with the tonic’s own chromatic mediants, letting each chord’s shared tone with F major (A♭maj7 keeps C, Amaj7 keeps A, D♭maj7 keeps F) carry the ear:

Original:       | Fmaj7 | Gm7   | Cm7   | F7    |
Reharmonized:   | Fmaj7 | A♭maj7 | Amaj7 | D♭maj7 |

Each substitute keeps the major quality and a shared tone, but the underlying scale degrees no longer behave predictably — this is deliberately outside circle-of-fifths logic, which is exactly the point. Whether it actually works depends entirely on the melody note sitting above each bar; check that first.

♫ Listen

John Coltrane — “Giant Steps” (Giant Steps, 1959/1960): listen for the relentless three-key cycle (B, G, E♭) — this is chromatic-mediant motion turned into the whole form of a tune.
Art Tatum — “Have You Met Miss Jones” (The Tatum Solo Masterpieces, rec. 1952–55): follow the bridge as it drops through B♭, G♭, and D — the same major-third shape Coltrane later made famous.