An augmented sixth chord is a type of altered chord with a subdominant function. It is named after the augmented sixth interval formed between two of its notes.

Harmonic Functions Nonharmonic Tones Secondary Dominants Modulation

Augmented Sixths

Building an Augmented Sixth Chord Types of Augmented Sixths Augmented Sixths in Major Keys Harmonic Function of Augmented Sixths Tritone Substitution and Augmented Sixths Augmented Sixths Musical Examples
Neapolitan Sixth Tritone Substitution

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José Rodríguez Alvira.