TonalityGUIDE - basic tonal music theory and analysis for undergraduates
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Longer Progressions

introduction diatonic chromatic

introduction | diminished 7th | augmented 6th | Neapolitan

short progs.
longer progs.

The example below is taken from a passage in C major, it nevertheless demonstrates the potential of the German augmented sixth for modulation. The augmented sixth in the first bar sounds the same as a dominant seventh of Db major (Ab7). The passage could therefore be a modulation from Db to C which are very far apart on the circle of fifths.

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TonalityGUIDE - Tonal Harmony and Voiceleading - Table of Contents