Class: Musa::Scales::BebopMajorScaleKind Private

Inherits:
ScaleKind show all
Defined in:
lib/musa-dsl/music/scale_kinds/bebop/bebop_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.

Bebop major scale kind.

BebopMajorScaleKind defines the bebop major scale, an eight-note scale that adds a chromatic passing tone (#5) to the major scale. This allows chord tones to fall on downbeats during eighth-note runs.

Pitch Structure

8 degrees plus extended:

Scale Degrees (uppercase for major quality):

  • I (tonic): Root (0 semitones)
  • II (supertonic): Major second (2 semitones)
  • III (mediant): Major third (4 semitones)
  • IV (subdominant): Perfect fourth (5 semitones)
  • V (dominant): Perfect fifth (7 semitones)
  • V# (passing): Augmented fifth (8 semitones) ← PASSING TONE
  • VI (submediant): Major sixth (9 semitones)
  • VII (leading): Major seventh (11 semitones)

Bebop Principle

The added #5 chromatic note ensures that:

  • Chord tones (1, 3, 5, 7) fall on strong beats
  • Non-chord tones fall on weak beats
  • Smooth chromatic connection between 5 and 6

Musical Character

The bebop major scale:

  • Used over major 7th and major 6th chords
  • Creates flowing eighth-note lines
  • Common in bebop and jazz standards

Usage

c_bebop_maj = Scales[:et12][440.0][:bebop_major][60]
c_bebop_maj[4].pitch  # G (67) - perfect 5th
c_bebop_maj[5].pitch  # G# (68) - augmented 5th (passing)
c_bebop_maj[6].pitch  # A (69) - major 6th

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[IV _4 subdominant fourth],
pitch: 5 },
             { functions: %i[V _5 dominant fifth],
pitch: 7 },
             { functions: %i[V# _6 sixth],
pitch: 8 },
             { functions: %i[VI _7 submediant seventh],
pitch: 9 },
             { functions: %i[VII _8 leading eighth],
pitch: 11 },
             { functions: %i[VIII _9 ninth],
pitch: 12 },
             { functions: %i[IX _10 tenth],
pitch: 12 + 2 },
             { functions: %i[X _11 eleventh],
pitch: 12 + 4 },
             { functions: %i[XI _12 twelfth],
pitch: 12 + 5 },
             { functions: %i[XII _13 thirteenth],
pitch: 12 + 7 },
             { functions: %i[XII# _14 fourteenth],
pitch: 12 + 8 },
             { functions: %i[XIII _15 fifteenth],
pitch: 12 + 9 },
             { functions: %i[XIV _16 sixteenth],
pitch: 12 + 11 }].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/bebop/bebop_major_scale_kind.rb', line 98

def grades
  8
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/bebop/bebop_major_scale_kind.rb', line 102

def id
  :bebop_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. 



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# File 'lib/musa-dsl/music/scale_kinds/bebop/bebop_major_scale_kind.rb', line 94

def pitches
  @@pitches
end