| Altered Chords | Chords that employ chromaticism.
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| Chromaticism | Refers to the use of pitches foreign to the key of the passage.
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| Essential Chromaticism | Refers to the use of tones from outside the scale as members of chords.
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| Nonessential Chromaticism | The use of chromatically altered tones as NCTs.
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| Secondary Function | A chord whose function belongs more closely to a key other than the main key of the passage. The most commonly encountered altered chord in tonal music.
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