The Pentatonic scale is one of the first things we learn. And since it is something we are very familiar with and we can use this to change it a bit and use it for other chord sounds like Altered Dominants or other melodic minor sounds. In this lesson I am going to show you a simple way to make a great pentatonic scale for altered chords and demonstrate how to learn and how to use it.
Creating the Pentatonic scale
I came up with this scale by playing a C minor pentatonic scale and then changing the C to a B. This is shown in example 1, first the C minor and then the B Lydian Augmented pentatonic scale.
As you can see in this example we can easily use that we already know 5 positions of pentatonic scales and that it is easy to “alter” the root so that we make them into or new pentatonic scale.
The Melodic Minor Connection
It is important to also notice that this scale, or 5 note set of notes. Is also a subset of the Ab melodic minor scale:
Melodic minor: Ab Bb B Db Eb F G Ab Ab Bb
Altered pentatonic: B Eb F G Bb B
This tells us that it is a part of the Ab melodic minor/ G Altered scale and we can also see that it is a good fit for the G7 with an F and a B in there.
Learning The Altered Dom7th Pentatonic Scale
Since the scale is layed out in 2 notes per string patterns across the neck, just like our normal pentatonic scales we can use some of the same exercises to get used to playing the scale
Here are a few excerpts:
The pentatonic scale in groups of 3 notes
The scale in groups of 4 notes:
Finding the chords in the scale
It is important to also have some of the structures under control in the scale. The place you probably want to start is to create some diatonic chords. In Example 5 I have stacked diatonic “3rds” which as you may know yields a lot of quartal harmony.
This exercise is shown here below:
The chords that we get from this are:
- G7alt Quartal Voicing
- Eb augmented triad
- F Quartal Voicing
- G7 Shell voicing
- Eb Maj triad (2nd inv)
All of them are quite useful as upper-structures on a G7 altered.
Using the scale as a melody
To demonstrate the way this pentatonic scale works in the context of a II V I I have made three examples.
The first example starts with a pattern of an Fmaj7 (the arpeggio from the 3rd of Dm7). The arepggio is played in a 1 5 3 7 pattern. The line continues with a descending scale run.
On the G7alt the line is simply an ascending run up the scale that is then finally resolved to the 9th(D).
The fact that the pentatonic scale is a bit unusual in the construction makes it possible to get away with using it as a melody in the most basic form as a sort of enriched arpeggio.
Putting some diatonic chords to use
The 2nd example starts with a Dm7 descending arpeggio. From here it continues with a short scale run.
On the G7alt the melody is first the G7(#9) quartal voicing and then a Eb augmented triad in inversion.
The line resolves to the 3rd(E) of Cmaj7.
The upper-structure triad
This example makes use of the Eb major triad as an upper structure on the G7alt.
The opening on the Dm7 line is constructed first from an F major triad followed by an Am pentatonic scale fragment. On the G7alt the line is an embellishment of an Eb root position triad followed by a small scale run that resolves to the 3rd of Cmaj7.
Working with these altered or modified pentatonic scales
When you work on using this pentatonic scale it is useful to try to tap into some of all the things you already have in your system with normal pentatonics. There is a lot of tips and ideas already explored on guitar in several styles using pentatonic scales after all.
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