Class: Musa::Scales::BluesScaleKind Private

Inherits:
ScaleKind show all
Defined in:
lib/musa-dsl/music/scale_kinds/blues/blues_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.

Blues scale kind (minor blues).

BluesScaleKind defines the blues scale, a six-note scale that adds the "blue note" (b5) to the minor pentatonic scale. This is the quintessential scale for blues, rock, and jazz improvisation.

Pitch Structure

6 degrees plus extended:

Scale Degrees (lowercase for minor quality):

  • i (tonic): Root (0 semitones)
  • iii (mediant): Minor third (3 semitones)
  • iv (subdominant): Perfect fourth (5 semitones)
  • blue (blue note): Diminished fifth (6 semitones) ← CHARACTERISTIC
  • v (dominant): Perfect fifth (7 semitones)
  • vii (subtonic): Minor seventh (10 semitones)

The Blue Note

The b5 (diminished fifth) is the defining characteristic of the blues scale. It creates tension that resolves either up to the 5th or down to the 4th, giving the scale its distinctive "bluesy" sound.

Musical Character

The blues scale:

  • Foundation of blues improvisation
  • Works over minor, dominant 7th, and even major chords
  • The blue note adds expressive tension
  • Common in blues, rock, jazz, and funk

Usage

a_blues = Scales[:et12][440.0][:blues][69]
a_blues.tonic  # A (69)
a_blues.blue   # Eb (75) - the blue note

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[iii _2 mediant second],
pitch: 3 },
             { functions: %i[iv _3 subdominant third],
pitch: 5 },
             { functions: %i[blue _4 fourth],
pitch: 6 },
             { functions: %i[v _5 dominant fifth],
pitch: 7 },
             { functions: %i[vii _6 subtonic sixth],
pitch: 10 },
             { functions: %i[viii _7 seventh],
pitch: 12 },
             { functions: %i[x _8 eighth],
pitch: 12 + 3 },
             { functions: %i[xi _9 ninth],
pitch: 12 + 5 },
             { functions: %i[blue2 _10 tenth],
pitch: 12 + 6 },
             { functions: %i[xii _11 eleventh],
pitch: 12 + 7 },
             { functions: %i[xiv _12 twelfth],
pitch: 12 + 10 }].freeze

Class Method Summary collapse

Constructor Details

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

Class Method Details

.grades ⇒ Object

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. 



87
88
89
 
# File 'lib/musa-dsl/music/scale_kinds/blues/blues_scale_kind.rb', line 87

def grades
  6
end

.id ⇒ Object

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. 



91
92
93
 
# File 'lib/musa-dsl/music/scale_kinds/blues/blues_scale_kind.rb', line 91

def id
  :blues
end

.pitches ⇒ Object

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. 



83
84
85
 
# File 'lib/musa-dsl/music/scale_kinds/blues/blues_scale_kind.rb', line 83

def pitches
  @@pitches
end