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There are always two tritones in quartal harmony, compared with one in tertian harmony. Five of them contain two consecutive perfect fourths (P4+P4), the remaining two contain a perfect fourth and an augmented fourth (P4+aug4 or aug4+P4). Seven quartal chords can be constructed from the notes in a scale. Similarly, C#DG, in bar 8, is the second inversion of D4. The GC#D chord in bar 7 is the first inversion of D4. In quartal harmony sus chords are inversions. In bar 3, the chord, GCD, is a modified triad and notated Gsus4. Even this can be difficult, and there is no easy way to annotate the DGC chord in bar 2.Ī suspended chord can be treated as a modified triad or as an inverted quartal chord. Chord notation is based on tertian harmony, so the best that can be done is to try to adapt a quartal chord to tertian notation. Thus, the chord D4 is in root position and contains the notes DGC# in the key of D major. This is not common usage, but it makes sense, and there is no tertian chord with a 4 after its name or number. The terms, major and minor, only apply to tertian harmony, not quartal harmony.Ī quartal chord can be notated by adding a 4 to the chord name or number, as in bar 6 of quartal harmony. Quartal harmony is not major or minor harmony. A triad has three notes and is constructed from successive intervals of a third, whereas a quartal chord, which also has three notes, is constructed from successive intervals of a fourth. It is constructed using the interval of a fourth whereas a tertian chord is constructed using the interval of a third. Quartal harmony is based on an interval of a fourth.Ī quartal chord is not a tertian chord. The quartal harmony figure shows the score. The first, in the key of D minor, is notated in tertian harmony, and the second, in the parallel key of D major, is notated in quartal harmony. Two identical harmonies are played in sequence. Quartal harmony plays tertian and quartal harmony on the piano. Audio: quartal harmony (0:08) Figure: quartal harmony
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