The Augmented Sixth chord we presented in the previous page and that appears below is often called Italian Sixth chord (iv degree triad in 1st inversion):

If we add the seventh to the Italian Sixth chord we get a German Augmented Sixth chord (IV degree seventh chord in 1st inversion). Note the parallel 5th between the German Sixth and the dominant chord between the bass and tenor voices:

You can avoid the parallel fifth by using the tonic chord in 2nd inversion before the dominant chord:

If we add an augmented 4th (from the bass note), we get the French Augmented Sixth chord (II degree seventh chord in 2nd inversion):


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José Rodríguez Alvira.