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Scale 2089: "Mujian"

Scale 2089: Mujian, Ian Ring Music Theory

Bracelet Diagram

The bracelet shows tones that are in this scale, starting from the top (12 o'clock), going clockwise in ascending semitones. The "i" icon marks imperfect tones that do not have a tone a fifth above. Dotted lines indicate axes of symmetry.

Tonnetz Diagram

Tonnetz diagrams are popular in Neo-Riemannian theory. Notes are arranged in a lattice where perfect 5th intervals are from left to right, major third are northeast, and major 6th intervals are northwest. Other directions are inverse of their opposite. This diagram helps to visualize common triads (they're triangles) and circle-of-fifth relationships (horizontal lines).

Common Names




Cardinality is the count of how many pitches are in the scale.

4 (tetratonic)

Pitch Class Set

The tones in this scale, expressed as numbers from 0 to 11


Forte Number

A code assigned by theorist Allen Forte, for this pitch class set and all of its transpositional (rotation) and inversional (reflection) transformations.


Rotational Symmetry

Some scales have rotational symmetry, sometimes known as "limited transposition". If there are any rotational symmetries, these are the intervals of periodicity.


Reflection Axes

If a scale has an axis of reflective symmetry, then it can transform into itself by inversion. It also implies that the scale has Ridge Tones. Notably an axis of reflection can occur directly on a tone or half way between two tones.



A palindromic scale has the same pattern of intervals both ascending and descending.



A chiral scale can not be transformed into its inverse by rotation. If a scale is chiral, then it has an enantiomorph.

enantiomorph: 643


A hemitone is two tones separated by a semitone interval. Hemitonia describes how many such hemitones exist.

1 (unhemitonic)


A cohemitone is an instance of two adjacent hemitones. Cohemitonia describes how many such cohemitones exist.

0 (ancohemitonic)


An imperfection is a tone which does not have a perfect fifth above it in the scale. This value is the quantity of imperfections in this scale.



Modes are the rotational transformations of this scale. This number does not include the scale itself, so the number is usually one less than its cardinality; unless there are rotational symmetries then there are even fewer modes.


Prime Form

Describes if this scale is in prime form, using the Rahn/Ring formula.

prime: 83


Indicates if the scale can be constructed using a generator, and an origin.


Deep Scale

A deep scale is one where the interval vector has 6 different digits.


Interval Structure

Defines the scale as the sequence of intervals between one tone and the next.

[3, 2, 6, 1]

Interval Vector

Describes the intervallic content of the scale, read from left to right as the number of occurences of each interval size from semitone, up to six semitones.

<1, 1, 1, 1, 1, 1>

Interval Spectrum

The same as the Interval Vector, but expressed in a syntax used by Howard Hanson.


Distribution Spectra

Describes the specific interval sizes that exist for each generic interval size. Each generic <g> has a spectrum {n,...}. The Spectrum Width is the difference between the highest and lowest values in each spectrum.

<1> = {1,2,3,6}
<2> = {4,5,7,8}
<3> = {6,9,10,11}

Spectra Variation

Determined by the Distribution Spectra; this is the sum of all spectrum widths divided by the scale cardinality.


Maximally Even

A scale is maximally even if the tones are optimally spaced apart from each other.


Maximal Area Set

A scale is a maximal area set if a polygon described by vertices dodecimetrically placed around a circle produces the maximal interior area for scales of the same cardinality. All maximally even sets have maximal area, but not all maximal area sets are maximally even.


Interior Area

Area of the polygon described by vertices placed for each tone of the scale dodecimetrically around a unit circle, ie a circle with radius of 1.


Polygon Perimeter

Perimeter of the polygon described by vertices placed for each tone of the scale dodecimetrically around a unit circle.


Myhill Property

A scale has Myhill Property if the Interval Spectra has exactly two specific intervals for every generic interval.



A scale is balanced if the distribution of its tones would satisfy the "centrifuge problem", ie are placed such that it would balance on its centre point.


Ridge Tones

Ridge Tones are those that appear in all transpositions of a scale upon the members of that scale. Ridge Tones correspond directly with axes of reflective symmetry.



Also known as Rothenberg Propriety, named after its inventor. Propriety describes whether every specific interval is uniquely mapped to a generic interval. A scale is either "Proper", "Strictly Proper", or "Improper".


Heteromorphic Profile

Defined by Norman Carey (2002), the heteromorphic profile is an ordered triple of (c, a, d) where c is the number of contradictions, a is the number of ambiguities, and d is the number of differences. When c is zero, the scale is Proper. When a is also zero, the scale is Strictly Proper.

(4, 1, 18)

Common Triads

There are no common triads (major, minor, augmented and diminished) that can be formed using notes in this scale.


Modes are the rotational transformation of this scale. Scale 2089 can be rotated to make 3 other scales. The 1st mode is itself.

2nd mode:
Scale 773
Scale 773: Esuian, Ian Ring Music TheoryEsuian
3rd mode:
Scale 1217
Scale 1217: Hician, Ian Ring Music TheoryHician
4th mode:
Scale 83
Scale 83: Amuian, Ian Ring Music TheoryAmuianThis is the prime mode


The prime form of this scale is Scale 83

Scale 83Scale 83: Amuian, Ian Ring Music TheoryAmuian


The tetratonic modal family [2089, 773, 1217, 83] (Forte: 4-Z15) is the complement of the octatonic modal family [863, 1523, 1997, 2479, 2809, 3287, 3691, 3893] (Forte: 8-Z15)


The inverse of a scale is a reflection using the root as its axis. The inverse of 2089 is 643

Scale 643Scale 643: Duxian, Ian Ring Music TheoryDuxian


Only scales that are chiral will have an enantiomorph. Scale 2089 is chiral, and its enantiomorph is scale 643

Scale 643Scale 643: Duxian, Ian Ring Music TheoryDuxian


In the abbreviation, the subscript number after "T" is the number of semitones of tranposition, "M" means the pitch class is multiplied by 5, and "I" means the result is inverted. Operation is an identical way to express the same thing; the syntax is <a,b> where each tone of the set x is transformed by the equation y = ax + b

Abbrev Operation Result Abbrev Operation Result
T0 <1,0> 2089       T0I <11,0> 643
T1 <1,1> 83      T1I <11,1> 1286
T2 <1,2> 166      T2I <11,2> 2572
T3 <1,3> 332      T3I <11,3> 1049
T4 <1,4> 664      T4I <11,4> 2098
T5 <1,5> 1328      T5I <11,5> 101
T6 <1,6> 2656      T6I <11,6> 202
T7 <1,7> 1217      T7I <11,7> 404
T8 <1,8> 2434      T8I <11,8> 808
T9 <1,9> 773      T9I <11,9> 1616
T10 <1,10> 1546      T10I <11,10> 3232
T11 <1,11> 3092      T11I <11,11> 2369
Abbrev Operation Result Abbrev Operation Result
T0M <5,0> 139      T0MI <7,0> 2593
T1M <5,1> 278      T1MI <7,1> 1091
T2M <5,2> 556      T2MI <7,2> 2182
T3M <5,3> 1112      T3MI <7,3> 269
T4M <5,4> 2224      T4MI <7,4> 538
T5M <5,5> 353      T5MI <7,5> 1076
T6M <5,6> 706      T6MI <7,6> 2152
T7M <5,7> 1412      T7MI <7,7> 209
T8M <5,8> 2824      T8MI <7,8> 418
T9M <5,9> 1553      T9MI <7,9> 836
T10M <5,10> 3106      T10MI <7,10> 1672
T11M <5,11> 2117      T11MI <7,11> 3344

The transformations that map this set to itself are: T0

Nearby Scales:

These are other scales that are similar to this one, created by adding a tone, removing a tone, or moving one note up or down a semitone.

Scale 2091Scale 2091: Mukian, Ian Ring Music TheoryMukian
Scale 2093Scale 2093: Mulian, Ian Ring Music TheoryMulian
Scale 2081Scale 2081: Modian, Ian Ring Music TheoryModian
Scale 2085Scale 2085: Mogian, Ian Ring Music TheoryMogian
Scale 2097Scale 2097: Munian, Ian Ring Music TheoryMunian
Scale 2105Scale 2105: Rigian, Ian Ring Music TheoryRigian
Scale 2057Scale 2057: Mopian, Ian Ring Music TheoryMopian
Scale 2073Scale 2073: Moyian, Ian Ring Music TheoryMoyian
Scale 2121Scale 2121: Nabian, Ian Ring Music TheoryNabian
Scale 2153Scale 2153: Navian, Ian Ring Music TheoryNavian
Scale 2217Scale 2217: Kagitonic, Ian Ring Music TheoryKagitonic
Scale 2345Scale 2345: Raga Chandrakauns, Ian Ring Music TheoryRaga Chandrakauns
Scale 2601Scale 2601: Raga Chandrakauns, Ian Ring Music TheoryRaga Chandrakauns
Scale 3113Scale 3113: Tigian, Ian Ring Music TheoryTigian
Scale 41Scale 41: Vietnamese Tritonic, Ian Ring Music TheoryVietnamese Tritonic
Scale 1065Scale 1065: Gonian, Ian Ring Music TheoryGonian

This scale analysis was created by Ian Ring, Canadian Composer of works for Piano, and total music theory nerd. Scale notation generated by VexFlow, graph visualization by Graphviz, and MIDI playback by MIDI.js. All other diagrams and visualizations are © Ian Ring. Some scale names used on this and other pages are ©2005 William Zeitler ( used with permission.

Pitch spelling algorithm employed here is adapted from a method by Uzay Bora, Baris Tekin Tezel, and Alper Vahaplar. (An algorithm for spelling the pitches of any musical scale) Contact authors Patent owner: Dokuz Eylül University, Used with Permission. Contact TTO

Tons of background resources contributed to the production of this summary; for a list of these peruse this Bibliography. Special thanks to Richard Repp for helping with technical accuracy, and George Howlett for assistance with the Carnatic ragas.