Scales reference
Octatonic Scale
The octatonic scale is an eight-note symmetrical collection built by alternating semitone and whole-tone steps. It is also widely called the diminished scale.
Developing reference
Overview
Two rotations are commonly described according to whether the collection begins with a semitone or a whole tone. They contain the same alternating principle but place their chord tones and tensions differently against a chosen root.
Construction
Continue alternating one- and two-semitone steps until the octave returns. The symmetry produces only three distinct pitch collections in twelve-tone equal temperament before transposition repeats existing content.
Characteristics
The scale contains interlocking diminished structures and several possible dominant-chord tensions. Its repeating minor-third symmetry makes multiple tonal interpretations available within the same collection.
Applications
Octatonic material can support diminished harmony, dominant tension, symmetrical sequencing, and movement between related chord tones. Clear context is important because the same pitch collection can imply several roots.