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
In scale and containing notes between them, as in the "miyako-bushi" scale used in "koto" and "shamisen" music and whose pitches are equivalent to the "in" scale: In Indian classical music, Gunkali (Hindustani) and Karnataka Shuddha Saveri (Carnatic) are nearly identical to the pentatonic "in" scale, highlighting the shared past of their origins. Some rare examples of ancient genres of Andean music (e.g. k'antu) use a scale similar to the "in" scale combined with melody leading with a parallel fifths and fourths. For example listen to "Machulas Kantu" by Bolivia Manta folk group ("Wiñayataqui", 1981). In scale The in" scale (also known