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Terms such as ‘altered’ and ‘extended’ chords are relatively simple to explain. Extended chords add other notes from the scale to the existing root-3rd-5th triad (for example, C-E-G), so if we add a ...
They are so commonplace that we take the theory behind them for granted. Here are five 7th chords, the theory underpinning them, and some ideas for modifying them ...