Half diminished scale

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Half diminished scale on C About this sound Play .
Half diminished scale
Modes I, II, III, IV, V, VI, VII
Component pitches
C, D, E, F, G, A, B, C
Number of pitch classes 7
Forte number 7-34
Complement 5-34

The half diminished scale is a musical scale more commonly known as "Locrian 2",[1] name which avoids confusion with the diminished scales (see octatonic scales) and the half-diminished seventh chord (min. 7, flat 5). It may be considered Mode VI, the sixth mode, of the ascending melodic minor scale. See: jazz scale.

In the key of C, the half-diminished scale built on D is associated with Dmi75, which functions as a iiø chord in minor. See: chord-scale system.


Locrian 2 is commonly used in jazz and some rock. It is commonly practiced by such neoclassical metal guitarists Michael Romeo, and such jazz pianists as Oscar Peterson and Jonah Cristall-Clarke.[citation needed]

The half diminished scales, although derived from classical scales, offer new potentials in modern harmonic and melodic structure.[clarification needed]