@tonaljs/key
v4.11.0
Published
Functions to work with musical keys
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@tonaljs/key
@tonaljs/key
Get scale and chords of major and minor keys.
Usage
ES6:
import { Key } from "tonal";
nodejs:
const { Key } = require("tonal");
API
Tonics of any key are represented with pitch classes (octaves are discarded).
Key.majorKey("C4"); // is equal to
Key.majorKey("C");
majorKey(tonic: string) => MajorKey
Major key properties for a given tonic. Example:
Key.majorKey("C") // =>
{
tonic: "C",
type: "major",
minorRelative: "A",
alteration: 0,
keySignature: "",
grades: ["I", "II", "III", "IV", "V", "VI", "VII"],
intervals: ["1P", "2M", "3M", "4P", "5P", "6M", "7M"],
scale: ["C", "D", "E", "F", "G", "A", "B"],
triads: ["C", "Dm", "Em", "F", "G" "Am", "Bdim"],
chords: ["Cmaj7", "Dm7", "Em7", "Fmaj7", "G7" "Am7", "Bm7b5"],
chordsHarmonicFunction: ["T", "SD", "T", "SD", "D", "T", "D"],
chordScales: ["C major", "D dorian", "E phrygian", "F lydian", "G mixolydian", "A minor", "B locrian"],
secondaryDominants: ["", "A7", "B7", "C7", "D7", "E7", ""],
secondaryDominantsMinorRelative: ["" "Em7b5", "F#m7", "Gm7", "Am7", "Bm7b5", ""],
substituteDominants: ["" "Eb7", "F7", "Gb7", "Ab7", "Bb7", ""],
substituteDominantsMinorRelative: ["" "Em7", "Cm7", "Dbm7", "Am7", "Fm7", ""]
}
minorKey(tonic: string) => MinorKey
Minor key properties for a given tonic. Example:
Key.minorKey("C") // =>
{
tonic: "C",
type: "minor",
relativeMajor: "Eb",
alteration: -3,
keySignature: "bbb",
natural: {
tonic: "C",
grades: ["I", "II", "bIII", "IV", "V", "bVI", "bVII"],
intervals: ["1P", "2M", "3m", "4P", "5P", "6m", "7m"],
scale: ["C", "D", "Eb", "F", "G", "Ab", "Bb"],
triads: ["Cm", "Ddim", "Eb", "Fm", "Gm", "Ab", "Bb"],
chords: ["Cm7", "Dm7b5", "Ebmaj7", "Fm7", "Gm7", "Abmaj7", "Bb7"],
chordsHarmonicFunction: ["T", "SD", "T", "SD", "D", "SD", "SD"],
chordScales: ["C minor", "D locrian", "Eb major", "F dorian", "G phrygian", "Ab lydian", "Bb mixolydian"
]
},
harmonic: {
tonic: "C",
grades: ["I", "II", "bIII", "IV", "V", "bVI", "VII"],
intervals: ["1P", "2M", "3m", "4P", "5P", "6m", "7M"],
scale: ["C", "D", "Eb", "F", "G", "Ab", "B"],
triads: ["Cm", "Ddim", "Ebaug", "Fm", "G", "Ab", "Bdim"],
chords: ["CmMaj7", "Dm7b5", "Eb+maj7", "Fm7", "G7" "Abmaj7", "Bo7"],
chordsHarmonicFunction: ["T", "SD", "T", "SD", "D", "SD", "D"],
chordScales: ["C harmonic minor", "D locrian 6", "Eb major augmented", "F lydian diminished", "G phrygian dominant", "Ab lydian #9", "B ultralocrian"
]
},
melodic: {
tonic: "C",
grades: ["I", "II", "bIII", "IV", "V", "VI", "VII"],
intervals: ["1P", "2M", "3m", "4P", "5P", "6M", "7M"],
scale: ["C", "D", "Eb", "F", "G", "A", "B"],
triads: ["Cm", "Dm", "Ebaug", "F", "G", "Adim", "Bdim"],
chords: ["Cm6", "Dm7", "Eb+maj7", "F7", "G7", "Am7b5", "Bm7b5" ],
chordsHarmonicFunction: ["T", "SD", "T", "SD", "D", "", ""],
chordScales: ["C melodic minor", "D dorian b2", "Eb lydian augmented", "F lydian dominant", "G mixolydian b6", "A locrian #2", "B altered"
]
}
}
majorTonicFromKeySignature(keySignature: string)
Example:
Key.majorTonicFromKeySignature("bbb"); // => Eb
HOW TO
How to get minor tonic from key signature
majorKey(majorTonicFromKeySignature("###")).relativeMinor; // => "F#"