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 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