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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.
Printable version; In other projects ... diminished: whole tone — Augmented scale: Augmented scale on C. ... Half diminished scale: Half diminished scale on C. Play ...
The second mode, also called the octatonic, diminished, whole-half, or half-whole scale, is divided into four groups of three notes each. It contains the intervals semitone, tone, semitone, tone, semitone, tone, semitone, tone – it has three transpositions, like the diminished 7th chord, and two modes: Play ⓘ
Printable version; In other projects ... leading whole tone scale, ... Lydian dominant ♭6: major Locrian scale: half-diminished ♭4 scale, altered dominant ♯2 scale:
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:
Its tonic chord is a diminished triad (B dim = B dim 5 min 3 = B D F, in the Locrian mode using the white-key diatonic scale with starting note B, corresponding to a C major scale starting on its 7th tone). This mode's diminished fifth and the Lydian mode's augmented fourth are the only modes that contain a tritone as a note in their modal scale.
The composer Olivier Messiaen called the whole-tone scale his first mode of limited transposition. The composer and music theorist George Perle calls the whole-tone scale interval cycle 2, or C2. Since there are only two possible whole-tone-scale positions (that is, the whole-tone scale can be transposed only once), it is either C2 0 or C2 1.
These modes are sometimes referred to as the whole step/half-step diminished scale and the half-step/whole step diminished scale, respectively. [10] Each of the three distinct scales can form differently named scales with the same sequence of tones by starting at a different point in the scale.