Jazz scales and improvisation
There is not a single group of scales that can be called jazz scales – a jazz pianist uses lots of different scales. But there are typical scales used in jazz and here is an overview. Concerning keys, F, Bb, Eb and Ab are all common in jazz since they works well for brass instrument.
This guide will include Bebop Scales, the Modal Scales and Jazz Minor scales.
The modal scales (often referred to as just modes) were once discovered in Ancient Greece. In modern days the modal scales are frequently used in jazz improvisation. Dorian is often played over minor chords, Lydian is often played over major chords and Mixolydian is often played over dominant chords.
Here are the modal scales in the standard order:
In theory the modal scales are more like keys or modus (‘interval’ in Latin), but we will use either “scales” or “modes” as terms. The modal scales will probably feel kind of complicated in the beginning, but the thing is: they are really just variations of major scales starting on another degree. Therefore, if you know the major scales you will have an easy job to memorize the modal scale.
If we take the C Major Scale and play it in the Dorian Mode, what happens is that the notes remain the same, but the starting point is altered. In other words, C - D - E - F - G - A - B change to D - E - F - G - A - B - C and become Dorian.
Here is a complete overview of the modus of C Major:
Ionian: The tonic is still C.
Dorian: The tonic change to D.
Phrygian: The tonic change to E.
Lydian: The tonic change to F.
Mixolydian: The tonic change to G.
Aeolian: The tonic change to A (this is identical with the A Minor Scale).
Locrian: The tonic change to B.
What is all this good for you may ask. Why don't stick to the regular Major scales? It is true that the notes are the same in modes as in Major scales, but not the note order and that makes a big difference. It is the changed order that gives them a unique sound quality that is caused by a different root note.
So how can we use the modes? As already said, the modes can become useful when you are playing a scale over a chord in an improvisation situation. Some modes (Ionian, Lydian and Mixolydian) will sound good with Major or Dominant chords and some (Dorian, Phrygian, Aeolian and Locrian) will sound good with Minor chords. Exceptions from this is possible, although.
Jazz Minor Scales
The “Jazz Minor Scale” is a melodic minor scale, but without any change of notes when descending, see Melodic Minor.
The Jazz Minor is often used as a replacement for other minor scales in jazz.
It is also possible to improvise jazz piano by playing the common Major and Minor scales. Backing tracks for jazz presented by Pianoscales.org.
C Sweet and Soft
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