Class: Musa::Scales::MinorNaturalScaleKind Private

Inherits:
ScaleKind show all
Defined in:
lib/musa-dsl/music/scale_kinds/minor_natural_scale_kind.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Natural minor scale kind (Aeolian mode).

MinorNaturalScaleKind defines the natural minor scale, parallel to the major scale but with a darker, melancholic character. It follows the pattern: W-H-W-W-H-W-W or intervals: M2-m2-M2-M2-m2-M2-M2 from the root.

Pitch Structure

7 diatonic degrees plus extended harmony (8th-13th):

Scale Degrees (Roman numerals, lowercase for minor):

  • i (tonic): Root (0 semitones)
  • ii (supertonic): Major second (2 semitones)
  • iii (mediant): Minor third (3 semitones, relative major)
  • iv (subdominant): Perfect fourth (5 semitones)
  • v (dominant): Perfect fifth (7 semitones)
  • vi (submediant): Minor sixth (8 semitones)
  • vii (subtonic): Minor seventh (10 semitones, NOT leading tone)

Extended degrees: viii-xiii (compound intervals)

Differences from Major

Compared to major scale (same tonic):

  • iii: Flatted third (minor third instead of major)
  • vi: Flatted sixth (minor sixth instead of major)
  • vii: Flatted seventh (minor seventh instead of major)

Relative Major

The iii degree is the root of the relative major scale (shares same notes but different tonic). For example:

  • A minor (natural) relative major: C major
  • C major relative minor: A minor

Function Aliases

Similar to major but with lowercase Roman numerals:

  • Numeric: _1, _2, _3, _4, _5, _6, _7
  • Roman: i, ii, iii, iv, v, vi, vii
  • Function: tonic, supertonic, mediant, subdominant, dominant, submediant
  • Ordinal: first, second, third, fourth, fifth, sixth, seventh
  • Special: relative/relative_major for iii

Usage

a_minor = Scales[:et12][440.0][:minor][69]
a_minor.tonic        # A (69)
a_minor.dominant     # E (76)
a_minor.iii          # C (72) - relative major root
a_minor.relative_major.as_root_of(:major)  # C major scale

See Also:

Constant Summary collapse

@@pitches =

This classvariable is part of a private API. You should avoid using this classvariable if possible, as it may be removed or be changed in the future. 

[{ functions: %i[i _1 tonic first],
pitch: 0 },
             { functions: %i[ii _2 supertonic second],
pitch: 2 },
             { functions: %i[iii _3 mediant relative relative_major third],
pitch: 3 },
             { functions: %i[iv _4 subdominant fourth],
pitch: 5 },
             { functions: %i[v _5 dominant fifth],
pitch: 7 },
             { functions: %i[vi _6 submediant sixth],
pitch: 8 },
             { functions: %i[vii _7 seventh],
pitch: 10 },
             { functions: %i[viii _8 eighth],
pitch: 12 },
             { functions: %i[ix _9 ninth],
pitch: 12 + 2 },
             { functions: %i[x _10 tenth],
pitch: 12 + 3 },
             { functions: %i[xi _11 eleventh],
pitch: 12 + 5 },
             { functions: %i[xii _12 twelfth],
pitch: 12 + 7 },
             { functions: %i[xiii _13 thirteenth],
pitch: 12 + 8 }].freeze

Class Method Summary collapse

Constructor Details

This class inherits a constructor from Musa::Scales::ScaleKind

Class Method Details

.grades ⇒ Integer

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Number of diatonic degrees.

Returns:

  • (Integer) —

    7



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# File 'lib/musa-dsl/music/scale_kinds/minor_natural_scale_kind.rb', line 109

def grades
  7
end

.id ⇒ Symbol

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Scale kind identifier.

Returns:

  • (Symbol) —

    :minor



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# File 'lib/musa-dsl/music/scale_kinds/minor_natural_scale_kind.rb', line 115

def id
  :minor
end

.pitches ⇒ Array<Hash>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Pitch structure.

Returns:

  • (Array<Hash>) —

    pitch definitions with functions and offsets



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# File 'lib/musa-dsl/music/scale_kinds/minor_natural_scale_kind.rb', line 103

def pitches
  @@pitches
end