Half diminished scale
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This scale is more commonly known as "Locrian sharp 2", or "Aeolian flat 5". Most musicians prefer these names, to avoid confusion with the diminished scales (see octatonic scales) and the half-diminished seventh chord (min. 7, flat 5). It is simply Mode VI of the ascending melodic minor scale. (See Locrian mode.) (See Modes of the melodic minor scale at Jazz scale.) [1]
[edit] Applications
Locrian #2 is commonly used in jazz and some rock. It is commonly practised by such neoclassical guitarists as Yngwie Malmsteen and Michael Romeo, and such jazz pianists as Oscar Peterson and Jonah Cristall-Clarke.
The half diminished scales, although derived from classical scales, offer fresh potentials in harmonic and melodic structure.