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Section 21.1 Augmented Sixth Chords

Augmented sixth chords are a special class of pre–dominant chords with notes that approach the dominant (\(\hat{5}\) ) from a half–step below (♯\(\hat{4}\) ) and from a half–step above (♭\(\hat{6}\) ) simultaneously.

Figure 21.1.1

In minor, ♭\(\hat{6}\) doesn't require a flat because \(\hat{6}\) is lowered in the minor key signature.