![]() This is usually done on dominant chords, and the four alterations that are commonly used are the ♭5, ♯5, ♭9 and ♯9. Whereas chord extension generally involves adding notes that are logically implied, chord alteration involves changing some of the typical notes. As Alfred Blatter explains,"An altered chord occurs when one of the standard, functional chords is given another quality by the modification of one or more components of the chord." įor example, altered notes may be used as leading tones to emphasize their diatonic neighbors. According to the broadest definition any chord with a nondiatonic chord tone is an altered chord, while the simplest use of altered chords is the use of borrowed chords, chords borrowed from the parallel key, and the most common is the use of secondary dominants. An altered chord is a chord in which one or more notes from the diatonic scale is replaced with a neighboring pitch from the chromatic scale. ![]()
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