Augmented Scale · Jazz Wiki

The augmented scale is a six-note symmetrical scale that divides the octave into two interlocking augmented triads a half step apart. It exists to solve a specific problem: how do you improvise smoothly over music built on major-third relationships — like Coltrane Changes — without constantly jumping between unrelated key centers? The answer is to fuse those key centers into a single six-note collection, so the “outside” sound of chromatic mediant motion becomes one scale you can just run.

What it actually contains

Build it by alternating a minor third and a half step, over and over, until you’ve used six notes and land back an octave up. In C, using the spelling jazz players actually write on lead sheets:

C augmented scale: C – E♭ – E – G – A♭ – B
Interval pattern: minor 3rd, half step, minor 3rd, half step, minor 3rd, half step

The scale ascending, one octave, with the minor-3rd/half-step pattern spelled out:

Because the pattern of Intervals repeats every major third, this scale only exists in four distinct transpositions — the C, E, and A♭ augmented scales contain the same six notes (allowing for Enharmonic Equivalence), so twelve possible roots collapse into just four collections. Stack up the two augmented triads hiding inside it and the construction becomes obvious:

C – E – G♯ (C augmented triad)
E♭ – G – B (E♭ augmented triad — enharmonically the same notes as B augmented, a half step below the first)

The C augmented scale as two interlocking augmented triangles a half step apart — rotate the whole figure a major third and the same six notes come back, which is why only four collections exist

Three hidden major triads, three keys

The real payoff is that three ordinary major triads live inside this hexatonic set, each a major third from the next — exactly the kind of chromatic-mediant relationship that drives major-third key cycles like the one in Giant Steps:

C major: C – E – G
E major: E – G♯ – B
A♭ major: A♭ – C – E

The three triads, each a major third from the last:

Because C, E, and A♭ are all major thirds apart, the augmented scale is effectively a “three-tonic” scale — one pitch collection that serves as home base for three different keys at once. This is why the scale is the natural vocabulary for Coltrane Changes: instead of thinking three separate ii–V–I cells, you can think one augmented scale and let it imply all three tonal centers as you move through it, a compact form of sheets-of-sound thinking.

What it fits, and what it doesn’t

Chord-scale-wise, the augmented scale is the go-to color for maj7♯5 chords, augmented triads, and — because it also contains a minor triad off each root (C–E♭–G, E–G–B, A♭–C♭–E♭) — it works over minor-major seventh sounds too. Players also borrow it more loosely over plain major and minor chords as a source of outside color, since three of its notes always belong to the underlying triad no matter which of the three tonics you’re anchoring to. It’s a genuinely useful tool for Intervallic Improvisation and Harmonic Superimposition, but it isn’t a universal fix — over a dominant 7th chord it clashes more than it clarifies, which is part of why it stayed a specialist’s scale rather than a first-year staple.

Don’t confuse it with whole tone

The single biggest mix-up: “augmented scale” is not the Whole Tone Scale. Both are six-note, highly symmetrical scales, but the whole-tone scale moves in even whole steps (no half steps at all), while the augmented scale alternates minor third and half step. The name “augmented” refers to the augmented triads built into the scale, not to some augmented variant of a major scale — don’t confuse it with Lydian-augmented, which is a different seven-note animal entirely. Within Chord-Scale Theory, think of the augmented scale as a cousin of The Diminished Scale: both are symmetric, both interlock a pair of triads a set interval apart, and both exist to make chromatic, non-functional harmony feel scalar rather than random.

♫ Listen

John Coltrane — “One Down, One Up” (Live at the Half Note, rec. 1965, released 2005): the marathon tenor solo pushes through polytonal, augmented-scale-flavored runs against the classic quartet; listen for the moments where his lines seem to pivot between three key centers without a clear seam.
Michael Brecker — “Delta City Blues” (Two Blocks from the Edge, 1998): the unaccompanied opening cadenza is built from augmented-scale patterns — probably the single clearest recorded demonstration of the scale as modern saxophone vocabulary.