Octatonic scale scale" . The twelve tones of the chromatic scale are covered by three disjoint diminished seventh chords. The notes from two such seventh-chords combination form an octatonic collection. Because there are three ways to select two from three, there are three octatonic scales in the twelve-tone system. Each octatonic scale has exactly two modes: the first begins its ascent with a whole step, while the second begins its ascent with a half step (semitone). These modes are sometimes referred to as the "whole step/half-step diminished scale" and the "half-step/whole step diminished scale", respectively. Each of the three distinct scales can
Bebop scale as the bebop minor scale) is derived from the Dorian mode and has a chromatic passing tone between the minor 3rd and the perfect 4th. \override Score.TimeSignature #'stencil = ##f \relative c' { </score> It has all the notes in both the Dorian scale and the Mixolydian scale of the same root. It is the 5th mode of the bebop dominant scale. A second form of the bebop Dorian scale features a major seventh bebop note between the dominant seventh and the tonic. \override Score.TimeSignature #'stencil = ##f \relative c' { </score> The second style, featuring the major seventh, is