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Scale 1743: "Epigyllic"

Scale 1743: Epigyllic, 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
Epigyllic
Dozenal
Kofian

Analysis

Cardinality

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

8 (octatonic)

Pitch Class Set

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

{0,1,2,3,6,7,9,10}

Forte Number

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

8-18

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: 3693

Hemitonia

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

5 (multihemitonic)

Cohemitonia

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

2 (dicohemitonic)

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.

7

Prime Form

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

no
prime: 879

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, 3, 1, 2, 1, 2]

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.

<5, 4, 6, 5, 5, 3>

Interval Spectrum

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

p5m5n6s4d5t3

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

Spectra Variation

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

2

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.

2.616

Polygon Perimeter

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

6.002

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.

(12, 59, 138)

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 TriadsD{2,6,9}342.08
D♯{3,7,10}342
F♯{6,10,1}342.08
Minor Triadscm{0,3,7}342.23
d♯m{3,6,10}441.92
f♯m{6,9,1}342.15
gm{7,10,2}342.08
Augmented TriadsD+{2,6,10}441.85
Diminished Triads{0,3,6}242.31
d♯°{3,6,9}242.31
f♯°{6,9,0}242.38
{7,10,1}242.46
{9,0,3}242.46
Parsimonious Voice Leading Between Common Triads of Scale 1743. Created by Ian Ring ©2019 cm cm c°->cm d#m d#m c°->d#m D# D# cm->D# cm->a° D D D+ D+ D->D+ d#° d#° D->d#° f#m f#m D->f#m D+->d#m F# F# D+->F# gm gm D+->gm d#°->d#m d#m->D# D#->gm f#° f#° f#°->f#m f#°->a° f#m->F# F#->g° g°->gm

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.

Diameter4
Radius4
Self-Centeredyes

Modes

Modes are the rotational transformation of this scale. Scale 1743 can be rotated to make 7 other scales. The 1st mode is itself.

2nd mode:
Scale 2919
Scale 2919: Molyllic, Ian Ring Music TheoryMolyllic
3rd mode:
Scale 3507
Scale 3507: Maqam Hijaz, Ian Ring Music TheoryMaqam Hijaz
4th mode:
Scale 3801
Scale 3801: Maptyllic, Ian Ring Music TheoryMaptyllic
5th mode:
Scale 987
Scale 987: Aeraptyllic, Ian Ring Music TheoryAeraptyllic
6th mode:
Scale 2541
Scale 2541: Algerian, Ian Ring Music TheoryAlgerian
7th mode:
Scale 1659
Scale 1659: Maqam Shadd'araban, Ian Ring Music TheoryMaqam Shadd'araban
8th mode:
Scale 2877
Scale 2877: Phrylyllic, Ian Ring Music TheoryPhrylyllic

Prime

The prime form of this scale is Scale 879

Scale 879Scale 879: Aeranyllic, Ian Ring Music TheoryAeranyllic

Complement

The octatonic modal family [1743, 2919, 3507, 3801, 987, 2541, 1659, 2877] (Forte: 8-18) is the complement of the tetratonic modal family [147, 609, 777, 2121] (Forte: 4-18)

Inverse

The inverse of a scale is a reflection using the root as its axis. The inverse of 1743 is 3693

Scale 3693Scale 3693: Stadyllic, Ian Ring Music TheoryStadyllic

Enantiomorph

Only scales that are chiral will have an enantiomorph. Scale 1743 is chiral, and its enantiomorph is scale 3693

Scale 3693Scale 3693: Stadyllic, Ian Ring Music TheoryStadyllic

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> 1743       T0I <11,0> 3693
T1 <1,1> 3486      T1I <11,1> 3291
T2 <1,2> 2877      T2I <11,2> 2487
T3 <1,3> 1659      T3I <11,3> 879
T4 <1,4> 3318      T4I <11,4> 1758
T5 <1,5> 2541      T5I <11,5> 3516
T6 <1,6> 987      T6I <11,6> 2937
T7 <1,7> 1974      T7I <11,7> 1779
T8 <1,8> 3948      T8I <11,8> 3558
T9 <1,9> 3801      T9I <11,9> 3021
T10 <1,10> 3507      T10I <11,10> 1947
T11 <1,11> 2919      T11I <11,11> 3894
Abbrev Operation Result Abbrev Operation Result
T0M <5,0> 3693      T0MI <7,0> 1743
T1M <5,1> 3291      T1MI <7,1> 3486
T2M <5,2> 2487      T2MI <7,2> 2877
T3M <5,3> 879      T3MI <7,3> 1659
T4M <5,4> 1758      T4MI <7,4> 3318
T5M <5,5> 3516      T5MI <7,5> 2541
T6M <5,6> 2937      T6MI <7,6> 987
T7M <5,7> 1779      T7MI <7,7> 1974
T8M <5,8> 3558      T8MI <7,8> 3948
T9M <5,9> 3021      T9MI <7,9> 3801
T10M <5,10> 1947      T10MI <7,10> 3507
T11M <5,11> 3894      T11MI <7,11> 2919

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 1741Scale 1741: Lydian Diminished, Ian Ring Music TheoryLydian Diminished
Scale 1739Scale 1739: Mela Sadvidhamargini, Ian Ring Music TheoryMela Sadvidhamargini
Scale 1735Scale 1735: Mela Navanitam, Ian Ring Music TheoryMela Navanitam
Scale 1751Scale 1751: Aeolyryllic, Ian Ring Music TheoryAeolyryllic
Scale 1759Scale 1759: Pylygic, Ian Ring Music TheoryPylygic
Scale 1775Scale 1775: Lyrygic, Ian Ring Music TheoryLyrygic
Scale 1679Scale 1679: Kydian, Ian Ring Music TheoryKydian
Scale 1711Scale 1711: Adonai Malakh, Ian Ring Music TheoryAdonai Malakh
Scale 1615Scale 1615: Sydian, Ian Ring Music TheorySydian
Scale 1871Scale 1871: Aeolyllic, Ian Ring Music TheoryAeolyllic
Scale 1999Scale 1999: Zacrygic, Ian Ring Music TheoryZacrygic
Scale 1231Scale 1231: Logian, Ian Ring Music TheoryLogian
Scale 1487Scale 1487: Mothyllic, Ian Ring Music TheoryMothyllic
Scale 719Scale 719: Kanian, Ian Ring Music TheoryKanian
Scale 2767Scale 2767: Katydyllic, Ian Ring Music TheoryKatydyllic
Scale 3791Scale 3791: Stodygic, Ian Ring Music TheoryStodygic

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.