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Scale 2495: "Aeolocrygic"

Scale 2495: Aeolocrygic, 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

Zeitler
Aeolocrygic
Dozenal
Pepian

Analysis

Cardinality

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

9 (enneatonic)

Pitch Class Set

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

{0,1,2,3,4,5,7,8,11}

Forte Number

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

9-3

Rotational Symmetry

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

none

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.

none

Palindromicity

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

no

Chirality

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

yes
enantiomorph: 4019

Hemitonia

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

7 (multihemitonic)

Cohemitonia

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

5 (multicohemitonic)

Imperfections

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.

3

Modes

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.

8

Prime Form

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

no
prime: 895

Generator

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

none

Deep Scale

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

no

Interval Structure

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

[1, 1, 1, 1, 1, 2, 1, 3, 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.

<7, 6, 7, 7, 6, 3>

Interval Spectrum

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

p6m7n7s6d7t3

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

Spectra Variation

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

2.222

Maximally Even

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

no

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.

no

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.

2.683

Polygon Perimeter

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

6.038

Myhill Property

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

no

Balanced

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.

no

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.

none

Propriety

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".

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.

(64, 107, 194)

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
Major TriadsC{0,4,7}442.24
C♯{1,5,8}342.53
E{4,8,11}442.12
G{7,11,2}342.53
G♯{8,0,3}342.24
Minor Triadscm{0,3,7}342.35
c♯m{1,4,8}342.35
em{4,7,11}342.24
fm{5,8,0}342.35
g♯m{8,11,3}442.24
Augmented TriadsC+{0,4,8}542
D♯+{3,7,11}442.24
Diminished Triadsc♯°{1,4,7}252.71
{2,5,8}242.76
{5,8,11}242.59
g♯°{8,11,2}252.71
{11,2,5}242.76
Parsimonious Voice Leading Between Common Triads of Scale 2495. Created by Ian Ring ©2019 cm cm C C cm->C D#+ D#+ cm->D#+ G# G# cm->G# C+ C+ C->C+ c#° c#° C->c#° em em C->em c#m c#m C+->c#m E E C+->E fm fm C+->fm C+->G# c#°->c#m C# C# c#m->C# C#->d° C#->fm d°->b° D#+->em Parsimonious Voice Leading Between Common Triads of Scale 2495. Created by Ian Ring ©2019 G D#+->G g#m g#m D#+->g#m em->E E->f° E->g#m f°->fm g#° g#° G->g#° G->b° g#°->g#m g#m->G#

view full size

Above is a graph showing opportunities for parsimonious voice leading between triads*. Each line connects two triads that have two common tones, while the third tone changes by one generic scale step.

Diameter5
Radius4
Self-Centeredno
Central Verticescm, C, C+, c♯m, C♯, d°, D♯+, em, E, f°, fm, G, g♯m, G♯, b°
Peripheral Verticesc♯°, g♯°

Modes

Modes are the rotational transformation of this scale. Scale 2495 can be rotated to make 8 other scales. The 1st mode is itself.

2nd mode:
Scale 3295
Scale 3295: Phroptygic, Ian Ring Music TheoryPhroptygic
3rd mode:
Scale 3695
Scale 3695: Kodygic, Ian Ring Music TheoryKodygic
4th mode:
Scale 3895
Scale 3895: Eparygic, Ian Ring Music TheoryEparygic
5th mode:
Scale 3995
Scale 3995: Ionygic, Ian Ring Music TheoryIonygic
6th mode:
Scale 4045
Scale 4045: Gyptygic, Ian Ring Music TheoryGyptygic
7th mode:
Scale 2035
Scale 2035: Aerythygic, Ian Ring Music TheoryAerythygic
8th mode:
Scale 3065
Scale 3065: Zothygic, Ian Ring Music TheoryZothygic
9th mode:
Scale 895
Scale 895: Aeolathygic, Ian Ring Music TheoryAeolathygicThis is the prime mode

Prime

The prime form of this scale is Scale 895

Scale 895Scale 895: Aeolathygic, Ian Ring Music TheoryAeolathygic

Complement

The enneatonic modal family [2495, 3295, 3695, 3895, 3995, 4045, 2035, 3065, 895] (Forte: 9-3) is the complement of the tritonic modal family [19, 769, 2057] (Forte: 3-3)

Inverse

The inverse of a scale is a reflection using the root as its axis. The inverse of 2495 is 4019

Scale 4019Scale 4019: Lonygic, Ian Ring Music TheoryLonygic

Enantiomorph

Only scales that are chiral will have an enantiomorph. Scale 2495 is chiral, and its enantiomorph is scale 4019

Scale 4019Scale 4019: Lonygic, Ian Ring Music TheoryLonygic

Transformations:

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> 2495       T0I <11,0> 4019
T1 <1,1> 895      T1I <11,1> 3943
T2 <1,2> 1790      T2I <11,2> 3791
T3 <1,3> 3580      T3I <11,3> 3487
T4 <1,4> 3065      T4I <11,4> 2879
T5 <1,5> 2035      T5I <11,5> 1663
T6 <1,6> 4070      T6I <11,6> 3326
T7 <1,7> 4045      T7I <11,7> 2557
T8 <1,8> 3995      T8I <11,8> 1019
T9 <1,9> 3895      T9I <11,9> 2038
T10 <1,10> 3695      T10I <11,10> 4076
T11 <1,11> 3295      T11I <11,11> 4057
Abbrev Operation Result Abbrev Operation Result
T0M <5,0> 3515      T0MI <7,0> 2999
T1M <5,1> 2935      T1MI <7,1> 1903
T2M <5,2> 1775      T2MI <7,2> 3806
T3M <5,3> 3550      T3MI <7,3> 3517
T4M <5,4> 3005      T4MI <7,4> 2939
T5M <5,5> 1915      T5MI <7,5> 1783
T6M <5,6> 3830      T6MI <7,6> 3566
T7M <5,7> 3565      T7MI <7,7> 3037
T8M <5,8> 3035      T8MI <7,8> 1979
T9M <5,9> 1975      T9MI <7,9> 3958
T10M <5,10> 3950      T10MI <7,10> 3821
T11M <5,11> 3805      T11MI <7,11> 3547

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 2493Scale 2493: Manyllic, Ian Ring Music TheoryManyllic
Scale 2491Scale 2491: Layllic, Ian Ring Music TheoryLayllic
Scale 2487Scale 2487: Dothyllic, Ian Ring Music TheoryDothyllic
Scale 2479Scale 2479: Harmonic and Neapolitan Minor Mixed, Ian Ring Music TheoryHarmonic and Neapolitan Minor Mixed
Scale 2463Scale 2463: Ionathyllic, Ian Ring Music TheoryIonathyllic
Scale 2527Scale 2527: Phradygic, Ian Ring Music TheoryPhradygic
Scale 2559Scale 2559: Decatonic Chromatic 2, Ian Ring Music TheoryDecatonic Chromatic 2
Scale 2367Scale 2367: Laryllic, Ian Ring Music TheoryLaryllic
Scale 2431Scale 2431: Gythygic, Ian Ring Music TheoryGythygic
Scale 2239Scale 2239: Dacryllic, Ian Ring Music TheoryDacryllic
Scale 2751Scale 2751: Sylygic, Ian Ring Music TheorySylygic
Scale 3007Scale 3007: Zyryllian, Ian Ring Music TheoryZyryllian
Scale 3519Scale 3519: Raga Sindhi-Bhairavi, Ian Ring Music TheoryRaga Sindhi-Bhairavi
Scale 447Scale 447: Thyphyllic, Ian Ring Music TheoryThyphyllic
Scale 1471Scale 1471: Radygic, Ian Ring Music TheoryRadygic

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 (http://allthescales.org) 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.