An augmented sixth chord is an altered chord with a subdominant function. The name derives from the fact than an augmented sixth interval is 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.