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The half diminished scale is a seven-note musical scale. It is more commonly known as the Locrian ♯ 2 scale [1] or the Aeolian ♭ 5 scale, names that avoid confusion with the diminished scale and the half-diminished seventh chord (minor seventh, diminished fifth). It is the sixth mode of the ascending melodic minor scale.
List of musical scales and modes Name Image Sound Degrees Intervals Integer notation # of pitch classes Lower tetrachord Upper tetrachord Use of key signature usual or unusual ; 15 equal temperament
The half-diminished seventh chord is frequently used in passages that convey heightened emotion. For example, the "mournful affect" [5] of the sombre opening Chorus of J. S. Bach's St Matthew Passion (1727) features the chord on the seventh beat of its first bar and on the first beat of its third bar:
half-diminished seventh chord: major seventh chord: Aeolian dominant scale, Dorian ♯3 ♭6 scale dominant seventh chord: half-diminished seventh chord: half-diminished seventh chord: minor major seventh chord: minor seventh chord: augmented major seventh chord: dominant seventh chord: Neapolitan major scale, Dorian ♭2 ♯7 scale minor major ...
Messiaen's mode 2, or the diminished scale, consists of semitone, tone, semitone, tone, semitone, tone, semitone, tone, which can only be arranged 2 ways, starting with either a tone or a semitone. Therefore, mode 2 has two modes. Any scale having the same number of modes as notes is not a mode of limited transposition.
Half-diminished seventh chord on C (Play ⓘ). A diminished triad with a minor seventh is a half-diminished chord, usually notated either Cm 7(♭ 5) or C ø7. A diminished triad played over a root a major third away creates a Dominant 7th chord, notated C 7, with a C Major triad on the bottom, and an E° from the chord third of C (C E G B ...
The chord notation for the diminished seventh chord (assuming root C) is Cdim 7 or C o 7 (or Cm 6 ♭ 5 for the enharmonic variant). The notation Cdim or C o normally denotes a (three-note) diminished triad, but some jazz charts or other music literature may intend for these to denote the four-note diminished seventh chord instead.
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 Mixolydian ♭ 6 scale t-t-s-t-s-t-t Like natural minor (aeolian) but with a major third; Half diminished scale on C Play ⓘ