Class: Musa::Scales::PentatonicMajorScaleKind Private

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

Major pentatonic scale kind.

PentatonicMajorScaleKind defines the major pentatonic scale, a five-note scale derived from the major scale by omitting the 4th and 7th degrees. It has a bright, open sound and is extremely common in folk, rock, and blues.

Pitch Structure

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

Scale Degrees (Roman numerals, uppercase for major):

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

Relationship to Major Scale

Major pentatonic = Major scale minus 4th and 7th degrees. This removes all semitone intervals, creating a scale with no dissonance.

Musical Character

The major pentatonic:

  • Has a bright, happy, open quality
  • No semitones = no tension or dissonance
  • Universal across cultures (found in music worldwide)
  • Common in folk, country, rock, pop, and blues

Usage

c_pent = Scales[:et12][440.0][:pentatonic_major][60]
c_pent.tonic     # C (60)
c_pent.dominant  # G (67)

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[II _2 supertonic second],
pitch: 2 },
             { functions: %i[III _3 mediant third],
pitch: 4 },
             { functions: %i[V _4 dominant fourth],
pitch: 7 },
             { functions: %i[VI _5 submediant fifth],
pitch: 9 },
             { functions: %i[VIII _6 sixth],
pitch: 12 },
             { functions: %i[IX _7 seventh],
pitch: 12 + 2 },
             { functions: %i[X _8 eighth],
pitch: 12 + 4 },
             { functions: %i[XII _9 ninth],
pitch: 12 + 7 },
             { functions: %i[XIII _10 tenth],
pitch: 12 + 9 }].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. 



81
82
83
 
# File 'lib/musa-dsl/music/scale_kinds/pentatonic/pentatonic_major_scale_kind.rb', line 81

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. 



85
86
87
 
# File 'lib/musa-dsl/music/scale_kinds/pentatonic/pentatonic_major_scale_kind.rb', line 85

def id
  :pentatonic_major
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. 



77
78
79
 
# File 'lib/musa-dsl/music/scale_kinds/pentatonic/pentatonic_major_scale_kind.rb', line 77

def pitches
  @@pitches
end