1. Chromatic Harmony (Substitution): c) Augmented Sixth Chords

Copyright © 2017 by Ainolnaim Azizol
All rights reserved.
Updated: 18 April 2017

1.c)1. Augmented Sixth Chord

  • Augmented sixth chords consists of three (3) altered or modified chords similar to N6 but with specific chord positions or inversions, harmonic intervals and names:

Italian Sixth (It6):        M3 –     –     –  Aug6       = triad in 1st inversion (light tension)

German Sixth (Gr6):   M3 –   P5    –  Aug6      = chord in 1st inversion (mild tension)

French Sixth (Fr6)      M3 – Aug4  –  Aug6      = chord in 2nd inversion (strong tension) 

  • Augmented sixth chords can be appeared in both major and minor key music as pre-dominant chords (progression resolve to chord V) and commonly through chord i 6-4 in minor key music to avoid parallel 5th (Fr6 – i6-4 – V).

1.c)2. Augmented sixth chords in 4-part Writing

  • The bass note of Aug6 must resolved.
  • It6 the 3rd from the bass is usually doubled.
  • The chromatic tone(s) must not be doubled.
  • The chord voicing must have at least one chromatic tone chord resolved and more or equal contrary motion against the bass (try to avoid any leading chromatic tone).
Aug6
Figure 1.c)

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Copyright © 2017 by Ainolnaim Azizol
All rights reserved.
Updated: 18 April 2017
This page can be cited as (APA format 6th Edition): Azizol, A. 2017. Music Theory: Metric and Tonal Structure. Retrieved from http://www.ainolnaim.wordpress.com