Diminished Scale Guitar: The Complete Guide to the Diminished Sound
By Daniel Weiss · Published · Updated
The diminished scale is a symmetric eight-note scale built by alternating whole steps and half steps. It comes in two forms: whole-half (used over diminished chords) and half-whole (used over dominant chords). Because of its minor-third symmetry, only three diminished scales exist, covering all twelve keys. This lesson gives you one use of it you can reach for on any dominant 7 chord: the half-whole scale over G7.
In Daniel’s course Diminished Licks and Workouts, the scale over G7 is the first workout.
Play this first: G half-whole over G7
G (root), string 6, fret 3; Ab, string 6, fret 4; Bb, string 6, fret 6; B, string 6, fret 7; Db, string 5, fret 4; D, string 5, fret 5; E, string 5, fret 7; F, string 4, fret 3; G (root), string 4, fret 5; Ab, string 4, fret 6; Bb, string 3, fret 3; B, string 3, fret 4; Db, string 3, fret 6; D, string 3, fret 7; D, string 2, fret 3; E, string 2, fret 5; F, string 2, fret 6; G (root), string 1, fret 3; Ab, string 1, fret 4; Bb, string 1, fret 6; B, string 1, fret 7
Play this. Slide into the position with the first finger, then play the G half-whole scale low to high and back down. Then play the same exact thing up a minor third: three frets higher. Then another minor third.
Listen for the half step, whole step, half step repeating. Over a G7 chord every note fits: G, B, D and F are the chord, and Ab, Bb, Db and E are the colours.
“We're talking about the half-whole scale, and we're starting and basing it off G as our root, which can technically be implied over G7 chord. So any dominant chord you see, you can utilize the half-whole scale, which is what we're talking about.”
Daniel Weiss, from the Diminished course workout
Those four colours are the flat nine (Ab), sharp nine (Bb), sharp eleven (Db) and natural thirteen (E). The flat nine sits a half step above the root, the sharp nine a half step below the third, the sharp eleven a half step below the fifth.
Loop a G7 chord and play only this scale. Land on the flat nine and sharp nine on purpose, then move to Cmaj7 and hear them resolve by step: Ab falls to G, Bb rises to B or C.
What is the diminished scale?
It is called half step whole step because it is built from a half step and a whole step, and it keeps repeating. That is why it is symmetrical.
The whole-half form, W-H-W-H-W-H-W-H, goes over diminished 7 chords. In C: C, D, Eb, F, Gb, Ab, A, B. The half-whole form, H-W-H-W-H-W-H-W, goes over dominant 7 chords. In C: C, Db, Eb, E, Gb, G, A, Bb.
G, string 6, fret 3; A, string 6, fret 5; Bb, string 6, fret 6; C (root), string 5, fret 3; Db, string 5, fret 4; Eb, string 5, fret 6; E, string 5, fret 7; Gb, string 4, fret 4; G, string 4, fret 5; A, string 4, fret 7; Bb, string 3, fret 3; C (root), string 3, fret 5; Db, string 3, fret 6; Eb, string 2, fret 4; E, string 2, fret 5; Gb, string 2, fret 7; G, string 1, fret 3; A, string 1, fret 5; Bb, string 1, fret 6
Play this. The easiest way to see the scale is on one string. Then learn it in a position, like the one above, and know the numbers as you play: 1, b2, #2, 3, #4, 5, 6, b7.
Listen for the same sound returning when you move the whole shape up three frets: whatever you learn in this scale transposes a minor third up or down.
Download the printable chart (PDF) (opens in a new tab)
Why there are only three diminished scales
C half-whole contains the exact same notes as Eb, Gb and A half-whole. Out of twelve starting notes there are three distinct scales: one fingering, four keys.
| Scale | Half-whole from | The 8 notes | Half-whole over | Whole-half over |
|---|---|---|---|---|
| Group 1 | C, Eb, Gb, A | C Db Eb E Gb G A Bb | C7, Eb7, Gb7, A7 | Dbdim7 (= Edim7, Gdim7, Bbdim7) |
| Group 2 | Db, E, G, Bb | Db D E F G Ab Bb B | Db7, E7, G7, Bb7 | Ddim7 (= Fdim7, Abdim7, Bdim7) |
| Group 3 | D, F, Ab, B | D Eb F Gb Ab A B C | D7, F7, Ab7, B7 | Ebdim7 (= Gbdim7, Adim7, Cdim7) |
C half-whole and Db whole-half are the same eight notes; the name depends on which note you call the root.
The major triads inside the scale
“It's not only about diminished arpeggios. You can also form major triads and move them up in minor thirds. So you can have G, Bb, Db, and E, all working on one chord on this G7 dominant diminished chord.”
Daniel Weiss, from the video above (8:41)
The four major triads in G dominant diminished
B, D, G: frets 4-3-3
B (3rd), string 3, fret 4; D (5th), string 2, fret 3; G (root), string 1, fret 3
D, F, Bb: frets 7-6-6
D (3rd), string 3, fret 7; F (5th), string 2, fret 6; Bb (root), string 1, fret 6
F, Ab, Db: frets 10-9-9
F (3rd), string 3, fret 10; Ab (5th), string 2, fret 9; Db (root), string 1, fret 9
G#, B, E: frets 13-12-12
G# (3rd), string 3, fret 13; B (5th), string 2, fret 12; E (root), string 1, fret 12
Play this. One first-inversion shape on strings 1-2-3, moved up three frets each time: G, Bb, Db, E. Then take just two of them a tritone apart, G and Db, and move between their inversions with the smallest steps.
Listen for how each triad colours the G7 differently: G is the chord itself, Bb adds the sharp nine, Db the flat nine and sharp eleven, E the thirteen.
| Triad | Notes | Over G7 |
|---|---|---|
| G major | G B D | Root, 3rd, 5th |
| Bb major | Bb D F | #9, 5th, b7 |
| Db major | Db F Ab | #11, b7, b9 |
| E major | E G# B | 13, b9 (G# = Ab), 3rd |
“What I like to do is just take a couple of triads, let's say just G and Db, which are a tritone apart, and they get this nice sound.” In the video, from 9:07.
The diminished 7 arpeggio and passing chords
Stack minor thirds from any note of the scale and you get a diminished 7 chord. C dim7 is C, Eb, Gb, A; C half-whole holds two of them, C Eb Gb A and Db E G Bb.
Gb (b5), string 6, fret 2; A (bb7), string 6, fret 5; C (root), string 6, fret 8; C (root), string 5, fret 3; Eb (b3), string 5, fret 6; Gb (b5), string 4, fret 4; A (bb7), string 4, fret 7; A (bb7), string 3, fret 2; C (root), string 3, fret 5; Eb (b3), string 3, fret 8; Eb (b3), string 2, fret 4; Gb (b5), string 2, fret 7; Gb (b5), string 1, fret 2; A (bb7), string 1, fret 5; C (root), string 1, fret 8
Play this. Minor third, minor third, minor third: the diminished 7 pattern, ascending and descending, in one position. Then the same thing up a minor third. One shape moves up three frets and gives you another diminished 7 chord, so C#dim7 = Edim7 = Gdim7 = Bbdim7.
Listen for the tritone inside it. Lower the fifth of a minor triad and you get it. “That's how you get the evil sound.” Daniel Weiss, in a lesson (26 January 2026)
As a chord, the diminished 7 connects two chords a whole step apart. Between Cmaj7 and Dm7 insert C#dim7: the bass walks C, C#, D, and three of the four notes resolve by a half step on the way out (C# to D, E to F, Bb to A).
Common diminished passing chord moves
| From | Passing chord | To | Bass motion |
|---|---|---|---|
| Cmaj7 | C#dim7 | Dm7 | C, C#, D (ascending) |
| Dm7 | D#dim7 | Em7 | D, D#, E (ascending) |
| Em7 | Ebdim7 | Dm7 | E, Eb, D (descending) |
| Fmaj7 | F#dim7 | G7 | F, F#, G (ascending) |
Practice this today
One thread, no timer: Daniel’s first two workouts, then the triads from the video, then the jam track. Repeat until the cue below is true.
- G half-whole in the position above, up and down. Then the same exact thing up a minor third, and another minor third.
- Thirds inside the position: play the scale in diatonic thirds, ascending and descending, then up a minor third.
- The four major triads, G, Bb, Db, E, up and back. Then only G and Db.
- Put the G7 track on and jam. Mix the scale with your pentatonic lines; stay on the scale for a beat or two, then land on a chord tone.
You’re ready to move on when you can play the position up and down and then the same thing up a minor third without stopping, and you hear the sound before your fingers find it.
Where the diminished sound leads
Diminished or altered?
Both scales work over a V7 like G7 resolving to Cmaj7. The difference is the thirteen: natural in the half-whole, flat in the altered scale (the seventh mode of melodic minor).
| Feature | Half-whole diminished | Altered scale |
|---|---|---|
| Formula | H-W-H-W-H-W-H-W (8 notes) | H-W-H-W-W-W-W (7 notes) |
| Tensions | b9, #9, #11, natural 13 | b9, #9, #11 (b5), b13 |
| Fits | G13b9 | G7alt |
| Same notes 3 frets higher | Yes (one shape, 4 roots) | No (the shape moves, the notes change) |
On a ii-V-I in C, the natural 13 (E) connects straight to the third of Cmaj7; the b13 (Eb) creates more friction first. Choose by the chord symbol, the melody and the colour you want.
Patterns and licks
Start with diatonic thirds through the scale, with a rhythm, one two three four. Then diatonic triads: every other note gives a diminished triad on every degree.
A very common thing to do is build a diminished major 7 arpeggio from each second degree: root, minor third, flat five, and the major seventh a half step below the root. More sequences: Scales and Arpeggios and Advanced Scale Patterns.
Blues, rock and fusion
In a blues in A, the move from A7 to A7/C# to D7 puts the third of A7 in the bass. Play C#dim7 there instead, A7b9 without its root, and you have the diminished version of the same move.
Over the A7, start with the Eb you already know from the blues scale: it also belongs to A half-whole. Then add the Bb (b9) and the F# (13), the two colours the blues scale does not have.
In rock and fusion the diminished 7 arpeggio is the same shape every three frets, so one sweep pattern works across the neck. Mix the scale with your pentatonic lines: it is a colour, not a style.
Frequently asked questions
- Why does the diminished scale only have three patterns for all twelve keys?
- The diminished scale is symmetrical and repeats every minor third (three frets), so the same three fingering patterns cycle through all twelve keys. Once you learn these three shapes on the fretboard, you can play diminished in any key without learning new patterns.
- When should I use the half-whole diminished scale versus the whole-half diminished scale?
- Use the half-whole diminished (starting with a half step) over dominant 7 chords to get altered tensions like flat nine and sharp nine. Use the whole-half diminished (starting with a whole step) over diminished 7 chords, including diminished passing chords.
- How do diminished scales give you altered dominant sounds without playing an altered chord?
- Playing the half-whole diminished scale over a dominant 7 chord automatically contains the altered extensions you need: flat nine, sharp nine, sharp eleven, and natural thirteen. This single scale substitution replaces the need to think about multiple altered voicings.
- Which diminished scale should I learn first?
- Start with G half-whole diminished (G-Ab-Bb-B-Db-D-E-F) over G7 chords, the first chart on this page. It gives you an immediate V7 to I application: G7 resolving to Cmaj7. Then the other two scales cover all keys.
- Why do diminished scales sound so dissonant?
- The scale holds the flat nine and the sharp nine at once, and both clash with the basic triad until they resolve.
- Can I use diminished scales in blues, rock and other non-jazz styles?
- Yes. Blues players add the diminished passing chord and the b5, b9 and 13 colours over dominant chords; rock and fusion players use the diminished 7 arpeggio because the shape repeats every three frets. Use it over the right moment, not through whole phrases.
- How long does it take to master diminished scales?
- There is no fixed timeline, so let the practice thread above be your test: the G position, the same thing up a minor third, the four triads, and a chorus over the G7 track that resolves into chord tones.