The diminished scale consists of eight notes. There are two types of diminished scales: the whole-step/half-step (or auxiliary diminished) and the half-step/whole-step (or auxiliary diminished dominant). The term diminished comes from the fact that degrees I, III, V, and VII form a diminished seventh chord.
The eight-tone scale is constructed by alternating whole step and half step intervals. This construction gives the scale 8 notes per octave. The eight-tone scale is also called the diminished scale. The eight-tone scale can also begin with a half step, sometimes referred to as a "half-whole diminished". Ex: C eight-tone scale consists of C, D, Eb, F, Gb, Ab, A and B. When constructing the diminished use the formula: W-H-W-H-W-H-W-H (1--½--1--½--1--½--1--½) OR H-W-H-W-H-W-H-W( or ½--1--½--1--½--1--½--1).
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