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In music, the mystic chord or Prometheus chord is a six-note synthetic chord and its associated scale, or pitch collection; which loosely serves as the harmonic and melodic basis for some of the later pieces by Russian composer Alexander Scriabin. Scriabin, however, did not use the chord directly but rather derived material from its transpositions.
The Lydian scale can be described as a major scale with the fourth scale degree raised a semitone, making it an augmented fourth above the tonic; e.g., an F-major scale with a B ♮ rather than B ♭. That is, the Lydian mode has the following formula:
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.
Lydian chords may function as subdominants or substitutes for the tonic in major keys. [3] The compound interval of the augmented eleventh (enharmonically equivalent to ♯ 4, the characteristic interval of the Lydian mode) is used since the simple fourth usually only appears in suspended chords (which replace the third with a natural fourth, for example C sus4).
A major fourth (Play ⓘ) is the interval that lies midway between the perfect fourth (500 cents) and the augmented fourth (600 cents) and is thus 550 cents (F). It inverts to a minor fifth. Wyschnegradsky considered it a good approximation of the eleventh harmonic [1] (11:8 or 551.32 cents). [2]
Download as PDF; Printable version; ... Augmented scale on C. Play ... A free Android app with scales & building chords for the scales;
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
Lydian augmented scale t-t-t-t-s-t-s combines the Lydian fourth with a raised fifth; Acoustic scale on C. Play ⓘ Acoustic scale or Lydian dominant scale t-t-t-s-t-s-t So-called because it is close to the scale built on natural overtones and combines Lydian raised fourth with Mixolydian (Dominant) flat seventh; Aeolian dominant scale or ...