Class: Musa::Scales::NeapolitanMinorScaleKind

Inherits:
ScaleKind show all
Defined in:
lib/musa-dsl/music/scale_kinds/ethnic/neapolitan_minor_scale_kind.rb

Overview

Neapolitan minor scale kind.

NeapolitanMinorScaleKind defines the Neapolitan minor scale, a harmonic minor scale with a lowered second degree, named after the Neapolitan school of opera in the 18th century.

Pitch Structure

7 diatonic degrees plus extended harmony:

Scale Degrees (lowercase for minor quality):

  • i (tonic): Root (0 semitones)
  • ii (supertonic): Minor second (1 semitone) ← NEAPOLITAN (b2)
  • iii (mediant): Minor third (3 semitones)
  • iv (subdominant): Perfect fourth (5 semitones)
  • v (dominant): Perfect fifth (7 semitones)
  • vi (submediant): Minor sixth (8 semitones)
  • vii (leading): Major seventh (11 semitones)

Relationship to Harmonic Minor

Neapolitan minor = Harmonic minor with lowered 2nd

Musical Character

The Neapolitan minor scale:

  • Dark, dramatic, operatic
  • The Neapolitan sixth chord (bII) is characteristic
  • Used in classical and film music
  • Strong resolution tendency to tonic

Usage

a_neap_min = Scales[:et12][440.0][:neapolitan_minor][69]
a_neap_min.tonic  # A (69)
a_neap_min.ii     # Bb (70) - minor second (Neapolitan)
a_neap_min.vii    # G# (80) - leading tone

See Also:

Constant Summary collapse

@@pitches = 
[{ functions: %i[i _1 tonic first],
pitch: 0 },
             { functions: %i[ii _2 supertonic second],
pitch: 1 },
             { functions: %i[iii _3 mediant third],
pitch: 3 },
             { functions: %i[iv _4 subdominant fourth],
pitch: 5 },
             { functions: %i[v _5 dominant fifth],
pitch: 7 },
             { functions: %i[vi _6 submediant sixth],
pitch: 8 },
             { functions: %i[vii _7 leading seventh],
pitch: 11 },
             { functions: %i[viii _8 eighth],
pitch: 12 },
             { functions: %i[ix _9 ninth],
pitch: 12 + 1 },
             { functions: %i[x _10 tenth],
pitch: 12 + 3 },
             { functions: %i[xi _11 eleventh],
pitch: 12 + 5 },
             { functions: %i[xii _12 twelfth],
pitch: 12 + 7 },
             { functions: %i[xiii _13 thirteenth],
pitch: 12 + 8 }].freeze

Class Method Summary collapse

Constructor Details

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

Class Method Details

.grades ⇒ Object 



89
90
91
 
# File 'lib/musa-dsl/music/scale_kinds/ethnic/neapolitan_minor_scale_kind.rb', line 89

def grades
  7
end

.id ⇒ Object 



93
94
95
 
# File 'lib/musa-dsl/music/scale_kinds/ethnic/neapolitan_minor_scale_kind.rb', line 93

def id
  :neapolitan_minor
end

.pitches ⇒ Object 



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

def pitches
  @@pitches
end