A short line from jazz fusion pioneer and guitar great john mclaughlin
John Mclaughlin Jazz fusion guitar improvisation tab and music notation
John Mclaughlin Jazz/Fusion Improvisation Guitar Line
Neapolitan 6ths and Augmented French, Italian and German 6th Chords
The “Neapolitan 6th” chord is a 1st inversion of the supertonic [chord two] triad but with the root and fifth lowered a half step. 
In modern terms we could think of it as a flattened second chord 1st inversion. Below is a more popular common approach.
Minor Key example:
[In this case only the root is lowered as the C minor key signature already has the Ab in the key signature]
OTHER COMMON AUGMENTED 6 TH CHORDS
These chords can occur on the flattened submediant [flattened chord 6] of the major scale or the normal submediant [chord 6] of the minor scale.
FRENCH SIXTH
ITALIAN 6TH
GERMAN 6TH
9ths 11ths and 13ths harmony:
One last idea using the 7th chord as a Diminished chord followed by the dominant 7th 1st inversion to C the Tonic chord.
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Fretboard Harmony: Harmonising the Dorian Mode
Harmonising the Dorian Mode video: Please watch for explanation:
In the exercises below you will see how to make the dorian mode sound “Jazzy”. We do this by harmonising the scale [Mode] in chords made of 4ths.
Not all are perfect 4ths though as you will see in the example below:
Here is the Dorian mode harmonised in 4ths. This use of 4ths creates what is known as quartal harmony.
C DORIAN MODE HARMONISED IN 4THS [QUARTAL HARMONY]
C DORIAN MODE BROKEN UP INTO 4THS
C DORIAN MODE “CHORDAL PICKING” IN 4THS
For more on the dorian mode, quartal harmony and modal jazz in general take a listen to the great Jazz pianist Mcoy Tyner.
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