Class: Musa::Scales::LydianScaleKind Private

Inherits:
ScaleKind show all
Defined in:
lib/musa-dsl/music/scale_kinds/modes/lydian_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.

Lydian mode (fourth mode of major scale).

LydianScaleKind defines the Lydian mode, a major mode with a characteristic raised fourth degree. It's built on the fourth degree of the major scale and has a bright, dreamy, floating quality.

Pitch Structure

7 diatonic degrees plus extended harmony (8th-13th):

Scale Degrees (Roman numerals, uppercase for major):

  • I (tonic): Root (0 semitones)
  • II (supertonic): Major second (2 semitones)
  • III (mediant): Major third (4 semitones)
  • IV (subdominant): Augmented fourth (6 semitones) ← CHARACTERISTIC
  • V (dominant): Perfect fifth (7 semitones)
  • VI (submediant): Major sixth (9 semitones)
  • VII (leading): Major seventh (11 semitones)

Key Difference from Major

The IV degree is raised from 5 semitones (perfect fourth) to 6 semitones (augmented fourth/tritone), creating:

  • A bright, ethereal quality
  • The characteristic "Lydian color"
  • A sense of floating or suspension

Musical Character

The Lydian mode:

  • Maintains major quality (major third)
  • Has a raised 4th that adds brightness and tension
  • Common in film scores and jazz (especially over maj7#11 chords)
  • Creates a dreamy, otherworldly atmosphere

Usage

f_lydian = Scales[:et12][440.0][:lydian][65]
f_lydian.tonic  # F (65)
f_lydian.IV     # B (71) - augmented fourth (characteristic)

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: 6 },
             { functions: %i[V _5 dominant fifth],
pitch: 7 },
             { functions: %i[VI _6 submediant sixth],
pitch: 9 },
             { functions: %i[VII _7 leading seventh],
pitch: 11 },
             { functions: %i[VIII _8 eighth],
pitch: 12 },
             { functions: %i[IX _9 ninth],
pitch: 12 + 2 },
             { functions: %i[X _10 tenth],
pitch: 12 + 4 },
             { functions: %i[XI _11 eleventh],
pitch: 12 + 6 },
             { functions: %i[XII _12 twelfth],
pitch: 12 + 7 },
             { functions: %i[XIII _13 thirteenth],
pitch: 12 + 9 }].freeze

Class Method Summary collapse

Constructor Details

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

Class Method Details

.grades ⇒ Integer

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.

Number of diatonic degrees.

Returns:

  • (Integer) —

    7



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# File 'lib/musa-dsl/music/scale_kinds/modes/lydian_scale_kind.rb', line 97

def grades
  7
end

.id ⇒ Symbol

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.

Scale kind identifier.

Returns:

  • (Symbol) —

    :lydian



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# File 'lib/musa-dsl/music/scale_kinds/modes/lydian_scale_kind.rb', line 103

def id
  :lydian
end

.pitches ⇒ Array<Hash>

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.

Pitch structure.

Returns:

  • (Array<Hash>) —

    pitch definitions with functions and offsets



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# File 'lib/musa-dsl/music/scale_kinds/modes/lydian_scale_kind.rb', line 91

def pitches
  @@pitches
end