Class: Musa::Scales::DorianB2ScaleKind

Inherits:

ScaleKind

• Object
• ScaleKind
• Musa::Scales::DorianB2ScaleKind

Defined in:

lib/musa-dsl/music/scale_kinds/melodic_minor/dorian_b2_scale_kind.rb

Overview

Dorian b2 scale kind (second mode of melodic minor).

DorianB2ScaleKind defines the Dorian b2 scale (also called Phrygian #6 or Javanese scale), the second mode of the melodic minor scale. It combines the Phrygian's lowered second with the Dorian's raised sixth.

Pitch Structure

7 diatonic degrees plus extended harmony:

Scale Degrees (lowercase for minor quality):

• i (tonic): Root (0 semitones)
• ii (supertonic): Minor second (1 semitone) ← CHARACTERISTIC (b2)
• iii (mediant): Minor third (3 semitones)
• iv (subdominant): Perfect fourth (5 semitones)
• v (dominant): Perfect fifth (7 semitones)
• vi (submediant): Major sixth (9 semitones) ← CHARACTERISTIC (#6)
• vii (subtonic): Minor seventh (10 semitones)

Relationship to Other Modes

• Dorian with lowered 2nd
• Phrygian with raised 6th
• 2nd mode of melodic minor

Musical Character

The Dorian b2 scale:

• Exotic, Eastern quality
• Minor with both Phrygian darkness and Dorian brightness
• Used over sus4(b9) chords in jazz
• Common in contemporary jazz and fusion

Usage

d_dor_b2 = Scales[:et12][440.0][:dorian_b2][62]
d_dor_b2.tonic  # D (62)
d_dor_b2.ii     # Eb (63) - minor second
d_dor_b2.vi     # B (71) - major sixth

See Also:

• Abstract base class
• Dorian mode
• Phrygian mode
• Parent melodic minor scale

Constant Summary

@@pitches =

[{ functions: %i[i _1 tonic first],
pitch: 0 },
             { functions: %i[ii _2 supertonic second],
pitch: 1 },
             { 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 subtonic seventh],
pitch: 10 },
             { functions: %i[viii _8 eighth],
pitch: 12 },
             { functions: %i[ix _9 ninth],
pitch: 12 + 1 },
             { 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

• .grades ⇒ Object
• .id ⇒ Object
• .pitches ⇒ Object

Constructor Details

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

Class Method Details

.grades ⇒ Object

# File 'lib/musa-dsl/music/scale_kinds/melodic_minor/dorian_b2_scale_kind.rb', line 92

def grades
  7
end

.id ⇒ Object

# File 'lib/musa-dsl/music/scale_kinds/melodic_minor/dorian_b2_scale_kind.rb', line 96

def id
  :dorian_b2
end

.pitches ⇒ Object

# File 'lib/musa-dsl/music/scale_kinds/melodic_minor/dorian_b2_scale_kind.rb', line 88

def pitches
  @@pitches
end