Class: Musa::Scales::MelodicMinorScaleKind

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

Overview

Melodic minor scale kind (ascending form).

MelodicMinorScaleKind defines the melodic minor scale in its ascending form (also called jazz minor). It has a minor third but major sixth and seventh, creating a unique hybrid between minor and major qualities.

Pitch Structure

7 diatonic degrees plus extended harmony:

Scale Degrees (lowercase for minor quality):

  • i (tonic): Root (0 semitones)
  • ii (supertonic): Major second (2 semitones)
  • iii (mediant): Minor third (3 semitones) ← MINOR
  • iv (subdominant): Perfect fourth (5 semitones)
  • v (dominant): Perfect fifth (7 semitones)
  • vi (submediant): Major sixth (9 semitones) ← MAJOR
  • vii (leading): Major seventh (11 semitones) ← MAJOR

Relationship to Other Scales

  • Minor third (like natural minor)
  • Major 6th and 7th (like major scale)
  • Parent scale for many jazz modes (Lydian Dominant, Altered, etc.)

Musical Character

The melodic minor scale:

  • Minor quality with major upper structure
  • Essential in jazz harmony
  • Less dark than harmonic minor (no augmented 2nd)
  • Smooth melodic contour

Usage

c_mel_min = Scales[:et12][440.0][:minor_melodic][60]
c_mel_min.tonic    # C (60)
c_mel_min.mediant  # Eb (63) - minor third
c_mel_min.leading  # B (71) - major seventh

See Also:

Constant Summary collapse

@@pitches = 
[{ functions: %i[i _1 tonic first],
pitch: 0 },
             { functions: %i[ii _2 supertonic second],
pitch: 2 },
             { functions: %i[iii _3 mediant 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: 9 },
             { functions: %i[vii _7 leading seventh],
pitch: 11 },
             { 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 + 9 }].freeze

Class Method Summary collapse

Constructor Details

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

Class Method Details

.grades ⇒ Object 



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# File 'lib/musa-dsl/music/scale_kinds/melodic_minor/melodic_minor_scale_kind.rb', line 92

def grades
  7
end

.id ⇒ Object 



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# File 'lib/musa-dsl/music/scale_kinds/melodic_minor/melodic_minor_scale_kind.rb', line 96

def id
  :minor_melodic
end

.pitches ⇒ Object 



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# File 'lib/musa-dsl/music/scale_kinds/melodic_minor/melodic_minor_scale_kind.rb', line 88

def pitches
  @@pitches
end