chord

README

Chord

A model of a musical chord.

A chord, in music, is any harmonic set of three or more notes that is heard as if sounding simultaneously.

Musical Chord on Wikipedia

Credit

Charney Kaye

XJ Music

Documentation

Overview

A chord, in music, is any harmonic set of three or more notes that is heard as if sounding simultaneously.

https://en.wikipedia.org/wiki/Chord_(music)

Credit

Charney Kaye <hi@charneykaye.com> https://charneykaye.com

XJ Music https://xj.io

Chords have different Forms, such as Triad, Seventh, Extended, Added/Omitted, Specific or General.

Chords have different Functions, such as Diatonic, Altered or Other.

A Chord Interval is how the members of the chord are counted, from 1 (the "root") to e.g. 3 (the "third") or 5 (the "fifth")

It's possible to export a list of all known chord parsing rules.

Chords are expressed in readable strings, e.g. CMb5b7 or Cm679-5

Chords have different Techniques, such as Block, Chordioid, Guitar, Open, Power or Slash.

Index

• type Chord
  • func Of(name string) Chord
  • func (this *Chord) Notes() (notes []*note.Note)
  • func (c Chord) ToYAML() string
  • func (this Chord) Transpose(semitones int) Chord
• type Form
  • func (this *Form) MatchString(s string) bool
• type FormAdd
• type FormOmit
• type Interval
• type List
  • func (l List) ToYAML() string

Types

type Chord

type Chord struct {
	Root      note.Class
	AdjSymbol note.AdjSymbol
	Tones     map[Interval]note.Class
}

Chord in a particular key

func Of

func Of(name string) Chord

Of a particular key, e.g. Of("C minor 7")

func (*Chord) Notes

func (this *Chord) Notes() (notes []*note.Note)

Notes to obtain the notes from the Chord

func (Chord) ToYAML

func (c Chord) ToYAML() string

func (Chord) Transpose

func (this Chord) Transpose(semitones int) Chord

Transpose a chord +/- semitones

type Form

type Form struct {
	Name string
	// contains filtered or unexported fields
}

Form is identified by positive/negative regular expressions, and then adds/removes pitch classes by interval from the root of the chord.

func (*Form) MatchString

func (this *Form) MatchString(s string) bool

MatchString processes the positive/negative regular expressions to determine if this form matches a string.

type FormAdd

type FormAdd map[Interval]int

FormAdd maps an interval-from-chord-root to a +/1 semitone adjustment

type FormOmit

type FormOmit []Interval

FormOmit maps an interval-from-chord-root to omit

type Interval

type Interval int

Interval within a chord, counted from 1 (the "root" to e.g. 3 (the "third") or 5 (the "fifth") up to 16.

const (
	I1  Interval = 1
	I2  Interval = 2
	I3  Interval = 3
	I4  Interval = 4
	I5  Interval = 5
	I6  Interval = 6
	I7  Interval = 7
	I8  Interval = 8
	I9  Interval = 9
	I10 Interval = 10
	I11 Interval = 11
	I12 Interval = 12
	I13 Interval = 13
	I14 Interval = 14
	I15 Interval = 15
	I16 Interval = 15
)

type List

type List []string

var ChordFormList List

func (List) ToYAML

func (l List) ToYAML() string

ToYAML any List to an array of strings