What is the Diminished Scale?

The diminished (scale) is one of the most used symmetrical scale in jazz music. It is an eight-note scale (octatonic) built by alternating whole and half steps.

There are two modes depending on whether we start to play with the whole tone, in that case we will call it ” fully diminished (scale) ” (also called Whole-half diminished), or with the half-tone, called ” dominant diminished (scale) ” (or Half-whole diminished).

These modes are based on an equal division of the octave into four (minor thirds divisions). They are often
confused yet it is very simple, one must be played over diminished seventh chords (dim7) and the other one over dominant seventh chords (7th).

What are the Two Modes of The Diminished Scale?

The whole-half diminished (scale) also named “inverted diminished scale” or “fully diminished” is constructed using a repeat pattern of whole and half steps. The formula is 1 – 9 – b3 – 11 – b5 – #5 – 13 – 7.
The half-whole diminished .scale (the diminished .scale) known as “dominant diminished scale” is constructed by repeating a pattern of half and whole steps. It is generally played over dominant 7 chords (7b9). The interval pattern is 1 – b9 – #9 – 3 – #11 (or b5) – 5 – 13 (6) – b7.

What is The Whole-Half Diminished Scale as Fully Diminished?

The whole half diminished ‘scale also known as “Fully Diminished ‘Scale” is an eight-tone scale, built by alternating whole steps and half steps, hence its name. It is used over diminished seventh chords (dim7). The formula is 1 – 9 – b3 – 11 – b5 – #5 – 13 – 7.

Because of its symmetry there are only three scales, C diminished ‘scale, Db diminished scale and D diminished scale. In other words, C, Eb, Gb and A diminished ‘scales contain the same notes. Db, E, G and Bb diminished scales are made up of the same notes. D , F, Ab and B diminished scales are also related.

How To Play The Fully Diminished Scale On Guitar?

Here are the guitar fretboard diagrams representing the whole half diminished ‘scale within the space of one octave.

It is important to start with the tonic (1) the orange dot in the diagrams. Afterwards, you can try to play these shapes from another tone.

Dont’ hesitate to play the corresponding chord, in order to hear the harmony.

Once you have memorized all the fingerings you must transpose them by moving the tonic on the desired note keeping the same intervals.

As has been mentioned previously, you can move any diminished scale position up or down three frets and you will still find the same notes, this is the principle of symmetric scales.

Whole-Half Diminished Scale – Two Octave Guitar Shapes

Here are the other whole-half diminished ‘scale shapes with notes speak out over two octaves.

Once you have memorized these fingerings you can try to create your own patterns. For example, in minor third intervals : 1 – b3 – 11 – b3 – b5 – 11 – #5 – b5 – 13 – #5 – 7 – 13 – 1 and the opposite. Then, try the same with other intervals: fourth, fifth, sixth…

The Half-Whole Diminished Scale – Dominant Diminished

What is The Half-Whole Diminished ‘Scale or Dominant Diminished?

The half-whole diminished ‘scale or dominant diminished ‘scale is symmetric. As its name implies, it is built by alternating half-steps and whole-steps. It is simply the opposite of the diminished ‘scale (whole half) shown before in this web page. The formula is 1 – b9 -#9 -3 – #11 (or b5) – 5 – 13 (6) – b7.

The half-whole diminished scale is widely used by jazz musicians to solo over dominant 7th chords, particularly 7b9 chords. It can bring interesting tensions in your playing by highlighting the b9, #9 and #11. It sounds great on the V of a major or minor II-V-I progression or the VIb9 of a I-VI-II-V progression that can be found into rhythm changes or jazz-blues tunes.

Here are the three main scales :

The C dominant diminished scale is made up of the same notes as the Eb, F# and A dominant diminished scales, as the C# contains the same notes as E, G and Bb. The D dominant diminished scale has the same notes as the F, Ab and B half-whole scale. That’s the symmetry.

To understand the symmetry, it is interesting to compare the two modes of the diminished scale:

H = Half step – W = whole step

As it is shown in the previous chart, these two modes have the same notes.

How To Play The Dominant Diminished Scale On Guitar?

Here are the half whole scale one octave guitar diagrams.

The tonic note (1), the orange note, is the most important note of a scale. This is the note that a scale is built from.

Once you have learned and memorized these guitar positions, try to transpose them in twelve keys by moving the root up or down keeping the same intervals.

You can also create your jazz lines using patterns as it is explained before in this lesson.

Dominant Diminished – Two Octave Shapes
Here are the other diminished guitar shapes that runs out two octaves in position.

You can also play the corresponding chord namely 7b9. This is an efficient way to relate scales and chords

Half-Whole Diminished 7th Lick and Diminished 7th Arpeggio
As you can see in the example below, the obvious way is to play the G half whole diminished scale over G7b9 . Please note the D diminished arpeggio within the Half whole diminished scale.

This example shows how you can use a B diminished 7th arpeggio over G7b9 in a minor II-V-I progression

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