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The augmented fourth (A4) occurs naturally between the fourth and seventh scale degrees of the major scale (for example, from F to B in the key of C major). It is also present in the natural minor scale as the interval formed between the second and sixth scale degrees (for example, from D to A ♭ in the key of C minor). The melodic minor scale ...
The augmented-fourth interval is the only interval whose inverse is the same as itself. The augmented-fourths tuning is the only tuning (other than the 'trivial' tuning C-C-C-C-C-C) for which all chords-forms remain unchanged when the strings are reversed. Thus the augmented-fourths tuning is its own 'lefty' tuning." [2]
An augmented chord is one which contains an augmented interval, almost invariably the 5th of the chord. An augmented triad is a major triad whose fifth has been raised by a chromatic semitone; it is the principal harmony of the whole tone scale. For example, the D ♭ augmented triad contains the notes D ♭ —F—A.
This contrasts with equal temperament, in which intervals with the same frequency ratio can have different names (e.g., the diminished fifth and the augmented fourth); and with other forms of just intonation, in which intervals with the same name can have different frequency ratios (e.g., 9/8 for the major second from C to D, but 10/9 for the ...
Diminished fourth, a perfect fourth narrowed by a chromatic semitone, thus spanning four semitones; Augmented fourth or tritone, an interval of three adjacent whole tones (six semitones) In addition, fourth in music may refer to: Quartal harmony, harmonic structures built from the perfect fourth, the augmented fourth and the diminished fourth
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