This week we’ll be looking at the 2 most flexible and common scales you’re ever likely to use in your bass lines: The Major and Minor Pentatonic scales. Pentatonic scales are simple 5 note scales so there are literally hundreds of possible variations. But the most common are the Major and Minor Pentatonic. In this lesson we’ll work through a basic 1 octave shape for each scale and then apply them to a simple chord progression.
The two scales we are going to look at today are the major and minor pentatonic scales. If you haven’t seen the previous lessons on this topic then here is a quick recap:
- Pentatonic – five-note scale
- Major pentatonic scale degrees – 1 2 3 5 6
- Minor pentatonic scale degrees – 1 b3 4 5 b7
- Major pentatonics can be used over most major type chords
- Minor pentatonics can be used over most minor type chords
Here are some examples of major and minor pentatonic scales. Start with C and then try the other positions given before moving to other root notes.
Another exercise you can do to help memorise a new shape is to repeat the scale and climb up the neck by moving the it up a semitone each time.
Pentatonic scales work over a lot of different chords because they are missing the two most dissonant tones in the respective natural scale.
The minor pentatonic does not contain the 2nd or the 6th degree of the natural minor scale.
The major pentatonic does not contain the 4th or 7th degree of the major scale.
Try coming up with your own riffs using these new scales.
Applying The Theory
We can use the major and minor pentatonic scales over a chord progression such as the one below. Here are the scales we can use for each chord:
C Maj 7 – C Major Pentatonic
Am7 – A Minor Pentatonic
Dm7 – D Minor Pentatonic
G7 – G major Pentatonic
Although a dominant chord does not fit exactly into the major scale, we can still use the major pentatonic scale here. This is because the only difference a dominant chord has from a major chord is that the former contains a minor 7th instead of a major 7th, and this is one of the two notes missed out in the major pentatonic scale.
Using the scales given above, create your own bass line to the following chord progression:
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