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Scale 2085: "Mogian"

Scale 2085: Mogian, 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: 1155


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: 75


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.

[2, 3, 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, 2, 0, 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> = {3,5,7,9}
<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, 3, 18)

Common Triads

These are the common triads (major, minor, augmented and diminished) that you can create from members of this scale.

* Pitches are shown with C as the root

Triad TypeTriad*Pitch ClassesDegreeEccentricityCloseness Centrality
Diminished Triads{11,2,5}000

The following pitch classes are not present in any of the common triads: {0}

Since there is only one common triad in this scale, there are no opportunities for parsimonious voice leading between triads.


Modes are the rotational transformation of this scale. Scale 2085 can be rotated to make 3 other scales. The 1st mode is itself.

2nd mode:
Scale 1545
Scale 1545: Jonian, Ian Ring Music TheoryJonian
3rd mode:
Scale 705
Scale 705: Edrian, Ian Ring Music TheoryEdrian
4th mode:
Scale 75
Scale 75: Iloian, Ian Ring Music TheoryIloianThis is the prime mode


The prime form of this scale is Scale 75

Scale 75Scale 75: Iloian, Ian Ring Music TheoryIloian


The tetratonic modal family [2085, 1545, 705, 75] (Forte: 4-13) is the complement of the octatonic modal family [735, 1785, 1995, 2415, 3045, 3255, 3675, 3885] (Forte: 8-13)


The inverse of a scale is a reflection using the root as its axis. The inverse of 2085 is 1155

Scale 1155Scale 1155, Ian Ring Music Theory


Only scales that are chiral will have an enantiomorph. Scale 2085 is chiral, and its enantiomorph is scale 1155

Scale 1155Scale 1155, Ian Ring Music Theory


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> 2085       T0I <11,0> 1155
T1 <1,1> 75      T1I <11,1> 2310
T2 <1,2> 150      T2I <11,2> 525
T3 <1,3> 300      T3I <11,3> 1050
T4 <1,4> 600      T4I <11,4> 2100
T5 <1,5> 1200      T5I <11,5> 105
T6 <1,6> 2400      T6I <11,6> 210
T7 <1,7> 705      T7I <11,7> 420
T8 <1,8> 1410      T8I <11,8> 840
T9 <1,9> 2820      T9I <11,9> 1680
T10 <1,10> 1545      T10I <11,10> 3360
T11 <1,11> 3090      T11I <11,11> 2625
Abbrev Operation Result Abbrev Operation Result
T0M <5,0> 1155      T0MI <7,0> 2085
T1M <5,1> 2310      T1MI <7,1> 75
T2M <5,2> 525      T2MI <7,2> 150
T3M <5,3> 1050      T3MI <7,3> 300
T4M <5,4> 2100      T4MI <7,4> 600
T5M <5,5> 105      T5MI <7,5> 1200
T6M <5,6> 210      T6MI <7,6> 2400
T7M <5,7> 420      T7MI <7,7> 705
T8M <5,8> 840      T8MI <7,8> 1410
T9M <5,9> 1680      T9MI <7,9> 2820
T10M <5,10> 3360      T10MI <7,10> 1545
T11M <5,11> 2625      T11MI <7,11> 3090

The transformations that map this set to itself are: T0, T0MI

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 2087Scale 2087: Muhian, Ian Ring Music TheoryMuhian
Scale 2081Scale 2081: Modian, Ian Ring Music TheoryModian
Scale 2083Scale 2083: Mofian, Ian Ring Music TheoryMofian
Scale 2089Scale 2089: Mujian, Ian Ring Music TheoryMujian
Scale 2093Scale 2093: Mulian, Ian Ring Music TheoryMulian
Scale 2101Scale 2101: Muqian, Ian Ring Music TheoryMuqian
Scale 2053Scale 2053: Powian, Ian Ring Music TheoryPowian
Scale 2069Scale 2069: Mowian, Ian Ring Music TheoryMowian
Scale 2117Scale 2117: Raga Sumukam, Ian Ring Music TheoryRaga Sumukam
Scale 2149Scale 2149: Nasian, Ian Ring Music TheoryNasian
Scale 2213Scale 2213: Raga Desh, Ian Ring Music TheoryRaga Desh
Scale 2341Scale 2341: Raga Priyadharshini, Ian Ring Music TheoryRaga Priyadharshini
Scale 2597Scale 2597: Raga Rasranjani, Ian Ring Music TheoryRaga Rasranjani
Scale 3109Scale 3109: Tidian, Ian Ring Music TheoryTidian
Scale 37Scale 37: Afoian, Ian Ring Music TheoryAfoian
Scale 1061Scale 1061: Gilian, Ian Ring Music TheoryGilian

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.