Class: Musa::Scales::PentatonicMinorScaleKind Private

Inherits:
ScaleKind show all
Defined in:
lib/musa-dsl/music/scale_kinds/pentatonic/pentatonic_minor_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.

Minor pentatonic scale kind.

PentatonicMinorScaleKind defines the minor pentatonic scale, a five-note scale derived from the natural minor scale by omitting the 2nd and 6th degrees. It's the foundation of blues and rock improvisation.

Pitch Structure

5 diatonic degrees plus extended (6th-10th):

Scale Degrees (Roman numerals, lowercase for minor):

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

Relationship to Natural Minor

Minor pentatonic = Natural minor minus 2nd and 6th degrees. This removes all semitone intervals, creating a scale with no dissonance.

Relative Major Pentatonic

A minor pentatonic shares the same notes as C major pentatonic. They are relative scales.

Musical Character

The minor pentatonic:

  • Has a bluesy, soulful quality
  • Foundation of blues and rock guitar solos
  • Works over both minor and dominant 7th chords
  • Easy to improvise with (no "wrong" notes)

Usage

a_pent = Scales[:et12][440.0][:pentatonic_minor][69]
a_pent.tonic     # A (69)
a_pent.dominant  # E (76)

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[v _4 dominant fourth],
pitch: 7 },
             { functions: %i[vii _5 subtonic fifth],
pitch: 10 },
             { functions: %i[viii _6 sixth],
pitch: 12 },
             { functions: %i[x _7 seventh],
pitch: 12 + 3 },
             { functions: %i[xi _8 eighth],
pitch: 12 + 5 },
             { functions: %i[xii _9 ninth],
pitch: 12 + 7 },
             { functions: %i[xiv _10 tenth],
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. 



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# File 'lib/musa-dsl/music/scale_kinds/pentatonic/pentatonic_minor_scale_kind.rb', line 87

def grades
  5
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. 



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# File 'lib/musa-dsl/music/scale_kinds/pentatonic/pentatonic_minor_scale_kind.rb', line 91

def id
  :pentatonic_minor
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. 



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# File 'lib/musa-dsl/music/scale_kinds/pentatonic/pentatonic_minor_scale_kind.rb', line 83

def pitches
  @@pitches
end