music-scale

music-scale is a module to create music scales. To create scales you can use intervals and tonic, type and tonic or scale name:

var scale = require('music-scale')

// get scale from name
scale.get('A major') // => ['A', 'B', 'C#', 'D', 'E', 'F#', 'G#']

// get scale from type and tonic
scale('major', 'A4') // => ['A4', 'B4', 'C#4', 'D4', 'E4', 'F#4', 'G#4']

// get scale from intervals and tonic
scale('1 2 3 4 5 6 7', 'A') // => ['A', 'B', 'C#', 'D', 'E', 'F#', 'G#']

// partially applied
var major = scale('major')
major('A') // => ['A', 'B', 'C#', 'D', 'E', 'F#', 'G#']
major('A4') // => ['A4', 'B4', 'C#4', 'D4', 'E4', 'F#4', 'G#4']

This is part of tonal:

var tonal = require('tonal')
tonal.scale.get('D3 bebop') // => ...

Install

Via npm: npm i --save music-scale

Usage

Scales are a pitch sets with a tonic. Scales can be created from a list of intervals and a tonic, from a scale type and tonic, or from scale name.

Create scales from name

You can use scale.get function to obtain scale notes from scale name:

scale.get('C major') // => ['C', 'D', 'E', 'F', 'G', 'A', 'B']

With scale function, you should pass the scale type and tonic as two parameters:

scale('major', 'C') // => ['C', 'D', 'E', 'F', 'G', 'A', 'B']

Or partially apply it:

var major = scale('major')
major('A') // => ['A', 'B', 'C#', 'D', 'E', 'F#', 'G#']

Get available names

The scale.names function returns available names:

scale.names() // => ['Maj7', 'm7', ...]
scale.names(true) // => ['Maj7', 'm7', ...] <= with aliases

Create scale from intervals

scale('1 2 3m 4 5 6m 7', 'D') // => ['D', 'E', 'F', 'G', 'A', 'Bb', 'C#']

This function can be partially applied:

var dorian = set('1 2 3b 4 5 6 7b')
dorian('eb') // => [ 'Eb', 'F', 'Gb', 'Ab', 'Bb', 'C', 'Db' ]

The source can be also another scale:

scale('C D E F G A B C', 'A') // => ['A', 'B', 'C#' 'D', 'E', 'F#', 'G#']

Or even a collection of notes:

scale('C2 d4 g7 a2', 'C') // => ['C', 'D', 'G', 'A']

Scale tonics

If the tonic of a scale is a pitch class (a note without octave) the notes of the scale are pitch classes:

var major = scale('C D E F G A B C')
major('A') // => ['A', 'B', 'C#' 'D', 'E', 'F#', 'G#']

If the tonic of the scale is a note with octave, the notes of the scale will have octave numbers:

major('A4') // => ['A4', 'B4', 'C#5' ,'D5', 'E5', 'F#5', 'G#5']

If the tonic is null and the source are notes, the first pitch class of the scale source will be the tonic:

major(null) // => ['C', 'D', 'E', 'F', 'G', 'A', 'B']
scale('d4 f5 g2 c6 a1', null) // => [ 'D', 'F', 'G', 'A', 'C' ]

Get scale intervals

If the tonic of a scale is false, the intervals are returned:

scale('major', false) // => ['P1', 'M2', 'M3', 'P4', 'P5', 'M6', 'M7']

License

MIT License