In music theory, an augmented sixth chord contains the interval of an augmented sixth above its "root" or bass tone (see below). This chord has its origins in the Renaissance, further developed in the Baroque, and became a distinctive part of the musical style of the Classical and Romantic periods.
Read more about Augmented Sixth Chord: Resolution and Chord Construction, Standard Harmonic Function, Variants, "Inverted" Augmented Sixth Chords, "Roots" of Augmented Sixth Chords, Extended Functions
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