Chromatic circle "discrete" structure, and there is no obvious way to assign pitch classes to each of its points. A pitch constellation is a graphical representation of pitches used to describe musical scales, modes, chords or other groupings of pitches within an octave range. It consists of a circle with markings along the circumference or lines from the center which indicate pitches. Most pitch constellations use of a subset of pitches chosen from the twelve pitch chromatic scale. In this case the points on the circle are spaced like the twelve hour markings on an analog clock where each tick mark represents
Scale (music) pitches. A common scale in Eastern music is the pentatonic scale, which consists of five notes that span an octave. Some scales span part of an octave; Several such short scales are typically combined to form a scale spanning a full octave or more, and usually called with a third name of its own. The Middle Eastern music has around a dozen such basic short scales that are combined to form hundreds of full-octave spanning scales. Among these middle eastern scales Hejaz scale has one scale step spanning 14 intervals (of the middle eastern type found 53 in an octave)