Heptatonic scale are considered subsets of a twelve-pitch scale roughly analogous to the Western chromatic scale. The first and fifth melakarta tones, corresponding to the first and eighth chromatic tones, are invariable in inflection, and the fourth melakarta tone, corresponding to the sixth or seventh chromatic tone, is allowed one of two inflections only, a natural ("shuddah") position and a raised ("tivra") position. The second and third melakarta tones can be picked from the 4 chromatic tones (second through fifth), and similarly for the sixth and seventh. Thus the number of possible forms is equal to twice the square of the number
Bebop scale Harris. Ben-Hur further elaborates on the concept of placing additional chromatic passing tones between other notes in the scales. The bebop harmonic minor scale (or bebop natural minor scale, as listed in Mark Levine's "The Drop 2 Book") is derived from the harmonic minor scale and has a chromatic passing tone (an additional 7) between the 6th and the 7th notes. \override Score.TimeSignature #'stencil = ##f \relative c' { </score> It contains all of the notes of both the harmonic minor scale and the natural minor scale (Aeolian mode) of the same root. It can be used on all three