class Mystic::Chord

• Mystic::Chord
• Reference
• Object

Overview

Represents a chord

A chord has a root note, intervals (indicating the intervals above the root in root position), and an array of notes

Some ways to create a Chord:

# Create with root note and quality
Chord.new(Note.new("C4"), "major")

# Create a chord with notes. The lowest will be assumed to be the root
# (C major)
Chord.new([Note.new("C4"), Note.new("E4"), Note.new("G4")])

# Create with root note and notes
# (C major, 1st inversion)
Chord.new(Note.new("C4"), [Note.new("E4"), Note.new("G4"), Note.new("C5")])

# Create chord with custom intervals
Chord.new(Note.new("C4"), [Interval.new("M2"), Interval.new("P5")])

# Shorthand with chord symbols
Chord.new("Cmb9#11")

Defined in:

Constant Summary

ALIASES = {dominant: "dominant seventh", diminished: "fully diminished", "augmented dominant seventh": "augmented seventh"}

INTERVAL_QUALITIES = QUALITY_INTERVALS.to_h.invert

QUALITY_INTERVALS = {major: ["M3", "P5"], minor: ["m3", "P5"], diminished: ["m3", "d5"], augmented: ["M3", "A5"], "major seventh": ["M3", "P5", "M7"], "dominant seventh": ["M3", "P5", "m7"], "minor seventh": ["m3", "P5", "m7"], "minor major seventh": ["m3", "P5", "M7"], "half diminished seventh": ["m3", "d5", "m7"], "fully diminished seventh": ["m3", "d5", "d7"], "augmented seventh": ["M3", "A5", "m7"], "augmented major seventh": ["M3", "A5", "M7"], mystic: ["A4", "m7", "M10", "M13", "M16"]}

Constructors

• .new(root : Mystic::Note, intervals : Array(Interval), notes : Array(Note) | Nil = nil)
• .new(root : Mystic::Note, notes : Array(Note))
• .new(root : Mystic::Note, quality : String, notes : Array(Note) | Nil = nil)
• .new(notes : Array(Note))
• .new(s : String)

Instance Method Summary

• #+(interval : Interval) : Chord
• #==(other : self) : Bool

  Returns true if this reference is the same as other.

• #bass : Note

  Returns the lowest note

• #get(member : Int32) : Note | Nil

  Return the given member

• #get(interval_from_root : Interval) : Note | Nil

  Return the member of the chord given a specific interval_from_root.

• #intervals : Array(Interval)
• #inversion : Int32

  Returns the inversion number, or 0 if in root position

• #invert(num : Int32, keep_root = true) : Chord

  Returns the result of inverting the chord num times (upwards)

• #invert(keep_root = true) : Chord

  Returns the result of inverting the chord once (upwards).

• #name : String
• #note_names : Array(String)
• #notes : Array(Note)
• #pitch_class_set : PitchClassSet

  Returns the PitchClassSet of the notes

• #quality : String

  Returns the chord quality

• #root : Note
• #root_position : Chord

  Returns the root position of the chord

Constructor Detail

Instance Method Detail

# Split 3rd chord (has 2 "3rds")
chord = Chord.new([Note.new("C4"), Note.new("Eb4"), Note.new("E4"), Note.new("G4")])
chord.get(Interval.new("M3")) # => Note.new("E4")