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Scale 2991: "Zanygic"

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: Zanygic

Dozenal: SUKian

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	{0,1,2,3,5,7,8,9,11}
Forte Number A code assigned by theorist Allen Forte, for this pitch class set and all of its transpositional (rotation) and inversional (reflection) transformations.	9-8
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: 3771
Hemitonia A hemitone is two tones separated by a semitone interval. Hemitonia describes how many such hemitones exist.	6 (multihemitonic)
Cohemitonia A cohemitone is an instance of two adjacent hemitones. Cohemitonia describes how many such cohemitones exist.	4 (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 includes the scale itself, so the number is usually the same as its cardinality; unless there are rotational symmetries then there are fewer modes.	9
Prime Form Describes if this scale is in prime form, using the Starr/Rahn algorithm.	no prime: 1503
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, an indicator of maximum hierarchization.	no
Interval Structure Defines the scale as the sequence of intervals between one tone and the next.	[1, 1, 1, 2, 2, 1, 1, 2, 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.	<6, 7, 6, 7, 6, 4>
Proportional Saturation Vector First described by Michael Buchler (2001), this is a vector showing the prominence of intervals relative to the maximum and minimum possible for the scale's cardinality. A saturation of 0 means the interval is present minimally, a saturation of 1 means it is the maximum possible.	<0, 0.5, 0, 0.333, 0, 1>
Interval Spectrum The same as the Interval Vector, but expressed in a syntax used by Howard Hanson.	p⁶m⁷n⁶s⁷d⁶t⁴
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} <2> = {2,3,4} <3> = {3,4,5} <4> = {4,5,6} <5> = {6,7,8} <6> = {7,8,9} <7> = {8,9,10} <8> = {10,11}
Spectra Variation Determined by the Distribution Spectra; this is the sum of all spectrum widths divided by the scale cardinality.	1.556
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.	yes
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.	2.799
Polygon Perimeter Perimeter of the polygon described by vertices placed for each tone of the scale dodecimetrically around a unit circle.	6.106
Myhill Property A scale has Myhill Property if the Distribution Spectra have exactly two specific intervals for every generic interval.	no
Centre of Gravity Distance When tones of a scale are imagined as physical objects of equal weight arranged around a unit circle, this is the distance from the center of the circle to the center of gravity for all the tones. A perfectly balanced scale has a CoG distance of zero.	0.111111
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.	(8, 94, 180)
Coherence Quotient The Coherence Quotient is a score between 0 and 1, indicating the proportion of coherence failures (ambiguity or contradiction) in the scale, against the maximum possible for a cardinality. A high coherence quotient indicates a less complex scale, whereas a quotient of 0 indicates a maximally complex scale.	0.779
Sameness Quotient The Sameness Quotient is a score between 0 and 1, indicating the proportion of differences in the heteromorphic profile, against the maximum possible for a cardinality. A higher quotient indicates a less complex scale, whereas a quotient of 0 indicates a scale with maximum complexity.	0.375

Generator

This scale has no generator.

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 Type	Triad^*	Pitch Classes	Degree	Eccentricity	Closeness Centrality
Major Triads	C♯	{1,5,8}	3	4	2.33
	F	{5,9,0}	3	4	2.33
	G	{7,11,2}	3	4	2.47
	G♯	{8,0,3}	4	4	2.07
Minor Triads	cm	{0,3,7}	2	4	2.47
	dm	{2,5,9}	3	4	2.47
	fm	{5,8,0}	4	4	2.07
	g♯m	{8,11,3}	4	4	2.2
Augmented Triads	C♯+	{1,5,9}	3	4	2.4
Augmented Triads	D♯+	{3,7,11}	3	4	2.4
Diminished Triads	d°	{2,5,8}	2	4	2.67
	f°	{5,8,11}	2	4	2.33
	g♯°	{8,11,2}	2	4	2.53
	a°	{9,0,3}	2	4	2.47
	b°	{11,2,5}	2	4	2.53

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.

Diameter	4
Radius	4
Self-Centered	yes

Modes

Modes are the rotational transformation of this scale. Scale 2991 can be rotated to make 8 other scales. The 1st mode is itself.

2nd mode: Scale 3543				Aeolonygic
3rd mode: Scale 3819				Aeolanygic
4th mode: Scale 3957				Porygic
5th mode: Scale 2013				Mocrygic
6th mode: Scale 1527				Aeolyrygic
7th mode: Scale 2811				Barygic
8th mode: Scale 3453				Katarygic
9th mode: Scale 1887				Aerocrygic

Prime

The prime form of this scale is Scale 1503

Scale 1503

Padygic

Complement

The enneatonic modal family [2991, 3543, 3819, 3957, 2013, 1527, 2811, 3453, 1887] (Forte: 9-8) is the complement of the tritonic modal family [69, 321, 1041] (Forte: 3-8)

Inverse

The inverse of a scale is a reflection using the root as its axis. The inverse of 2991 is 3771

Scale 3771

Stophygic

Interval Matrix

Each row is a generic interval, cells contain the specific size of each generic. Useful for identifying contradictions and ambiguities.

Contradictions (8)

Ambiguities(94)

Hierarchizability

Based on the work of Niels Verosky, hierarchizability is the measure of repeated patterns with "place-finding" remainder bits, applied recursively to the binary representation of a scale. For a full explanation, read Niels' paper, Hierarchizability as a Predictor of Scale Candidacy. The variable k is the maximum number of remainders allowed at each level of recursion, for them to count as an increment of hierarchizability. A high hierarchizability score is a good indicator of scale candidacy, ie a measure of usefulness for producing pleasing music. There is a strong correlation between scales with maximal hierarchizability and scales that are in popular use in a variety of world musical traditions.

k	Hierarchizability	Breakdown Pattern
1	1	`111101011101`
2	3	`1([11]0[11])0([11]0[11])`
3	3	`1([11]0[11])0([11]0[11])`
4	3	`1([11]0[11])0([11]0[11])`
5	3	`1([11]0[11])0([11]0[11])`

Enantiomorph

Only scales that are chiral will have an enantiomorph. Scale 2991 is chiral, and its enantiomorph is scale 3771

Scale 3771

Stophygic

Center of Gravity

If tones of the scale are imagined as identical physical objects spaced around a unit circle, the center of gravity is the point where the scale is balanced.

Position with origin in the center	(0, -0.111111)
Distance from Center	0.111111
Angle in degrees measured clockwise starting from the root.	0
Angle in cents 100 cents = 1 semitone.	0

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. A note about the multipliers: multiplying by 1 changes nothing, multiplying by 11 produces the same result as inversion. 5 is the only non-degenerate multiplier, with the multiplier 7 producing the inverse of 5.

Abbrev	Operation	Result	Abbrev	Operation	Result
T₀	<1,0>	2991	T₀I	<11,0>	3771
T₁	<1,1>	1887	T₁I	<11,1>	3447
T₂	<1,2>	3774	T₂I	<11,2>	2799
T₃	<1,3>	3453	T₃I	<11,3>	1503
T₄	<1,4>	2811	T₄I	<11,4>	3006
T₅	<1,5>	1527	T₅I	<11,5>	1917
T₆	<1,6>	3054	T₆I	<11,6>	3834
T₇	<1,7>	2013	T₇I	<11,7>	3573
T₈	<1,8>	4026	T₈I	<11,8>	3051
T₉	<1,9>	3957	T₉I	<11,9>	2007
T₁₀	<1,10>	3819	T₁₀I	<11,10>	4014
T₁₁	<1,11>	3543	T₁₁I	<11,11>	3933
Abbrev	Operation	Result	Abbrev	Operation	Result
T₀M	<5,0>	3771	T₀MI	<7,0>	2991
T₁M	<5,1>	3447	T₁MI	<7,1>	1887
T₂M	<5,2>	2799	T₂MI	<7,2>	3774
T₃M	<5,3>	1503	T₃MI	<7,3>	3453
T₄M	<5,4>	3006	T₄MI	<7,4>	2811
T₅M	<5,5>	1917	T₅MI	<7,5>	1527
T₆M	<5,6>	3834	T₆MI	<7,6>	3054
T₇M	<5,7>	3573	T₇MI	<7,7>	2013
T₈M	<5,8>	3051	T₈MI	<7,8>	4026
T₉M	<5,9>	2007	T₉MI	<7,9>	3957
T₁₀M	<5,10>	4014	T₁₀MI	<7,10>	3819
T₁₁M	<5,11>	3933	T₁₁MI	<7,11>	3543

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 2989				Bebop Minor
Scale 2987				Neapolitan Major and Minor Mixed
Scale 2983				Zythyllic
Scale 2999				Diminishing Nonamode
Scale 3007				Zyryllian
Scale 2959				Dygyllic
Scale 2975				Gaptygic
Scale 3023				Aeracrygic
Scale 3055				Messiaen Mode 7
Scale 2863				Aerogyllic
Scale 2927				Rodygic
Scale 2735				Gynyllic
Scale 2479				Harmonic and Neapolitan Minor Mixed
Scale 3503				Zyphygic
Scale 4015				Phradyllian
Scale 943				Aerygyllic
Scale 1967				Diatonic Dorian Mixed

This scale analysis was created by Ian Ring, Canadian Composer of works for Piano, and total music theory nerd. Scale notation generated by VexFlow and Lilypond, graph visualization by Graphviz, audio by TiMIDIty and FFMPEG. 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, and ©2023 Robert Bedwell, used with permission.

Pitch spelling algorithm employed here is adapted from a method by Uzay Bora, Baris Tekin Tezel, and Alper Vahaplar. (DOI, Patent owner: Dokuz Eylül University, Used with Permission.

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 naming the Carnatic ragas. Thanks to Niels Verosky for collaborating on the Hierarchizability diagrams. Thanks to u/howaboot for inventing the Center of Gravity metrics.