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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]
A bass guitar creates a dissonant effect mid-song, when it plays an F♯ against an A minor, the major sixth of the chord, and the augmented fourth of the key. Then Roger Waters takes over the lead vocal. The piano becomes staccato, as the lyric takes on a warning tone, with Waters singing "If you should go skating/On the thin ice of modern ...
This is often interpreted as a quartal hexachord consisting of an augmented fourth, diminished fourth, augmented fourth, and two perfect fourths.The chord is related to other pitch collections, such as being a hexatonic subset of the overtone scale, also known in jazz circles as the Lydian dominant scale, lacking the perfect fifth.
The striking sound of the augmented triad lends itself to effective word painting, especially when conveying strong emotion. The first song in Robert Schumann’s song cycle Frauen-Liebe und Leben uses the chord (F ♯-B ♭-D) on the second syllable of the word “empor” to convey the intensity of the singer’s feeling for her beloved:.
D minor is a common key for music relating to death, as evidenced by other compositions such as Liszt's Totentanz [5] and the statue scene of Wolfgang Mozart's Don Giovanni. The first theme also heavily uses the tritone (augmented 4th or diminished 5th); this interval was known as the Devil's interval (or "Devil in music") and further ...
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Chords by perfect fourth are ambiguous in that, like all chords built by equidistant intervals (diminished seventh chords or augmented triads), any member can function as the root. The indifference of this rootless harmony to tonality places the burden of key verification upon the voice with the most active melodic line.