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Scale 517: "Aluian"

Scale 517: Aluian, 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

Dozenal
Aluian

Analysis

Cardinality

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

3 (tritonic)

Pitch Class Set

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

{0,2,9}

Forte Number

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

3-7

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: 1033

Hemitonia

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

0 (anhemitonic)

Cohemitonia

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

0 (ancohemitonic)

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.

2

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.

2

Prime Form

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

no
prime: 37

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.

[2, 7, 3]

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.

<0, 1, 1, 0, 1, 0>

Interval Spectrum

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

pns

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> = {2,3,7}
<2> = {5,9,10}

Spectra Variation

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

3.333

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.

0.683

Polygon Perimeter

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

4.346

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.

(1, 0, 6)

Common Triads

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

Modes

Modes are the rotational transformation of this scale. Scale 517 can be rotated to make 2 other scales. The 1st mode is itself.

2nd mode:
Scale 1153
Scale 1153: Choian, Ian Ring Music TheoryChoian
3rd mode:
Scale 41
Scale 41: Vietnamese Tritonic, Ian Ring Music TheoryVietnamese Tritonic

Prime

The prime form of this scale is Scale 37

Scale 37Scale 37: Afoian, Ian Ring Music TheoryAfoian

Complement

The tritonic modal family [517, 1153, 41] (Forte: 3-7) is the complement of the enneatonic modal family [1471, 1789, 2027, 2783, 3061, 3439, 3767, 3931, 4013] (Forte: 9-7)

Inverse

The inverse of a scale is a reflection using the root as its axis. The inverse of 517 is 1033

Scale 1033Scale 1033: Allian, Ian Ring Music TheoryAllian

Enantiomorph

Only scales that are chiral will have an enantiomorph. Scale 517 is chiral, and its enantiomorph is scale 1033

Scale 1033Scale 1033: Allian, Ian Ring Music TheoryAllian

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> 517       T0I <11,0> 1033
T1 <1,1> 1034      T1I <11,1> 2066
T2 <1,2> 2068      T2I <11,2> 37
T3 <1,3> 41      T3I <11,3> 74
T4 <1,4> 82      T4I <11,4> 148
T5 <1,5> 164      T5I <11,5> 296
T6 <1,6> 328      T6I <11,6> 592
T7 <1,7> 656      T7I <11,7> 1184
T8 <1,8> 1312      T8I <11,8> 2368
T9 <1,9> 2624      T9I <11,9> 641
T10 <1,10> 1153      T10I <11,10> 1282
T11 <1,11> 2306      T11I <11,11> 2564
Abbrev Operation Result Abbrev Operation Result
T0M <5,0> 1537      T0MI <7,0> 13
T1M <5,1> 3074      T1MI <7,1> 26
T2M <5,2> 2053      T2MI <7,2> 52
T3M <5,3> 11      T3MI <7,3> 104
T4M <5,4> 22      T4MI <7,4> 208
T5M <5,5> 44      T5MI <7,5> 416
T6M <5,6> 88      T6MI <7,6> 832
T7M <5,7> 176      T7MI <7,7> 1664
T8M <5,8> 352      T8MI <7,8> 3328
T9M <5,9> 704      T9MI <7,9> 2561
T10M <5,10> 1408      T10MI <7,10> 1027
T11M <5,11> 2816      T11MI <7,11> 2054

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 519Scale 519: Deyian, Ian Ring Music TheoryDeyian
Scale 513Scale 513: Major Sixth Ditone, Ian Ring Music TheoryMajor Sixth Ditone
Scale 515Scale 515: Depian, Ian Ring Music TheoryDepian
Scale 521Scale 521: Astian, Ian Ring Music TheoryAstian
Scale 525Scale 525, Ian Ring Music Theory
Scale 533Scale 533: Dehian, Ian Ring Music TheoryDehian
Scale 549Scale 549: Raga Bhavani, Ian Ring Music TheoryRaga Bhavani
Scale 581Scale 581: Eporic 2, Ian Ring Music TheoryEporic 2
Scale 645Scale 645: Duyian, Ian Ring Music TheoryDuyian
Scale 773Scale 773: Esuian, Ian Ring Music TheoryEsuian
Scale 5Scale 5: Vietnamese Ditonic, Ian Ring Music TheoryVietnamese Ditonic
Scale 261Scale 261: Bozian, Ian Ring Music TheoryBozian
Scale 1029Scale 1029: Ampian, Ian Ring Music TheoryAmpian
Scale 1541Scale 1541: Jilian, Ian Ring Music TheoryJilian
Scale 2565Scale 2565: Pogian, Ian Ring Music TheoryPogian

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.