Class: Musa::Scales::BluesMajorScaleKind

Inherits:

ScaleKind

• Object
• ScaleKind
• Musa::Scales::BluesMajorScaleKind

Defined in:

lib/musa-dsl/music/scale_kinds/blues/blues_major_scale_kind.rb

Overview

Major blues scale kind.

BluesMajorScaleKind defines the major blues scale, a six-note scale that adds the "blue note" (b3) to the major pentatonic scale. It provides a brighter blues sound than the minor blues scale.

Pitch Structure

6 degrees plus extended:

Scale Degrees (uppercase for major quality):

• I (tonic): Root (0 semitones)
• II (supertonic): Major second (2 semitones)
• blue (blue note): Minor third (3 semitones) ← CHARACTERISTIC
• III (mediant): Major third (4 semitones)
• V (dominant): Perfect fifth (7 semitones)
• VI (submediant): Major sixth (9 semitones)

The Blue Note

The b3 (minor third) is the blue note in the major blues scale. It creates tension that resolves up to the major third, providing the characteristic "bend" sound in blues guitar and vocals.

Musical Character

The major blues scale:

• Brighter alternative to minor blues
• Works well over major and dominant 7th chords
• Common in country blues and jazz
• The b3 to natural 3 movement is essential

Usage

c_blues_maj = Scales[:et12][440.0][:blues_major][60]
c_blues_maj.tonic    # C (60)
c_blues_maj.blue     # Eb (63) - the blue note
c_blues_maj.mediant  # E (64) - major third

See Also:

• Abstract base class
• Major pentatonic (without blue note)
• Minor blues scale

Constant Summary

@@pitches =

[{ functions: %i[I _1 tonic first],
pitch: 0 },
             { functions: %i[II _2 supertonic second],
pitch: 2 },
             { functions: %i[blue _3 third],
pitch: 3 },
             { functions: %i[III _4 mediant fourth],
pitch: 4 },
             { functions: %i[V _5 dominant fifth],
pitch: 7 },
             { functions: %i[VI _6 submediant sixth],
pitch: 9 },
             { functions: %i[VIII _7 seventh],
pitch: 12 },
             { functions: %i[IX _8 eighth],
pitch: 12 + 2 },
             { functions: %i[blue2 _9 ninth],
pitch: 12 + 3 },
             { functions: %i[X _10 tenth],
pitch: 12 + 4 },
             { functions: %i[XII _11 eleventh],
pitch: 12 + 7 },
             { functions: %i[XIII _12 twelfth],
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/blues/blues_major_scale_kind.rb', line 88

def grades
  6
end

.id ⇒ Object

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

def id
  :blues_major
end

.pitches ⇒ Object

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

def pitches
  @@pitches
end