The Altered Scale | Guitar Lesson with Diagrams, Scale charts, Theory and Licks
What's The Altered Scale?
The altered scale sometimes referred to as super Locrian mode or Locrian b4 is the seventh mode of the melodic minor scale. It contains one altered fifth (b5), two altered ninth (b9 and #9) and one altered thirteenth (b13). The formula is 1, b9, #9, 3, b5, b13 and b7. This scale is used to solo over Dominant chords when you want to create tension in your jazz lines.
|G altered scale||G||Ab||Bb||B||Db||Eb||F|
The altered scale have some common points with the half-whole diminished scale (aka dominant diminished scale). The formula for the dominant diminished scale is 1 - b9 -#9 - 3 - b5 - 5 - 13 - b7 whereas the altered scale formula is 1- b9 - #9 - 3 - b5 - b13 and b7. The half-whole diminished scale is an octatonic scale meaning that it is built of 8 notes. The altered scale contains 7 notes.
The altered scale is so-called because it contains all four common altered notes generally used to add tension when soloing over a dominant chord. These four notes altered notes are b9 - #9 - b13 - b5.
|G altered scale||G||Ab||Bb||B||Db||Eb||F|
|G Dominant chord||G||B||D||F|
Related Altered Chords
Altered chords are generally simplified and written "ALT", for example G7b5 or G7b13 can be written G7alt. There are many possible combinations of altered chords because it's very difficult to play all of those altered notes in a same chord at the same time. So, the choice is yours, you are free to add one or two extensions to your altered chord, which could give several options :
- and many more...
You need to know that the altered scale sounds good with other altered chords as 7#11 or 7#5, indeed the b5 can be considered as #11 and the b13 as #5.
Here are some guitar neck diagrams of altered chords that fit with the altered scale.
In this example, we will apply a minor triad on G7alt to create a strong pull towards CMaj7. Playing a minor triad starting on the b9 of a dominant chord highlight some interesting altered notes as the b9, b13 and #9.
This means that in a II-V-I progression in C major you can play an Ab minor triad over G7alt. If you have carefully read the previous section of this lesson named "RELATIVE CHORDS" you will understand that you can play a G7b9 chord, or a G7b13, a G7#9 or even a G7b13#9.
Altered Lick Using The Dominant Pentatonic Scale
You are probably wondering what's the dominant pentatonic scale. It contains the four notes of a dominant chord namely root (1), major third (3), perfect fifth (5) and minor seventh (b7) with a supplementary note, the second (2) which can be seen as the ninth (9).
The dominant pentatonic scale is commonly used over dominant 7 chords starting on the root, but can be used as a tritone substitution, this is where it gets very interesting. Indeed, when playing a Mixolydian pentatonic scale starting on the b5 of a dominant chord you highlight three altered notes, the b5 (aka #11), b13 and b9.
The following example takes a major II-V-I progression in C major. You can notice the use of the Db7 dominant pentatonic scale over G7. This creates an interesting sound and a bit of tension.
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Last edited: 2021-06-14