Music theory library
The project is under development.
npm install --save goodchordsor
yarn add goodchordsimport { Scale, Chord, Interval, Note } from "goodchords";const { Scale, Chord, Interval, Note } = require("goodchords");Usage example:
<html lang="en">
<head>
<title>Goodchords</title>
<script src="https://cdn.jsdelivr.net/npm/goodchords@X/dist/goodchords.umd.js"></script>
<script>
alert(window.goodchords.Note.fromString("A4").frequency());
</script>
</head>
</html>Replace X with correct version
const note = new Note("A", "#", 4);
// or
const note = Note.fromString("A#4");
note.transpose("M3").toString(); // C##5
note.toString(); // A#4
note.frequency(); // 466.16
note.distanceTo("A#5"); // 12
note.number(); // 58const interval = new Interval(8, "P");
// or
const interval = Interval.fromString("8P"); // or P8
interval.semitones(); // 12
interval.isValid(); // true
interval.isCompound(); // false
Note.fromString("A4").transpose(interval).toString(); // A5const majorScaleFormula = ["P1", "M2", "M3", "P4", "P5", "M6", "M7"];
const scale = new Scale("A", majorScaleFormula);
scale.getNotes().map((note) => note.toString()); // ["A4", "B4", "C#5", "D5", "E5", "F#5", G#5", ]
const ionian = new Scale("C", "ionian");
ionian.getNotes().map((note) => note.toString()); // ["C4", "D4", "E4", "F4", "G4", "A4", "B4", ]
ionian.getChords(); // get chords for scale by degree
ionian.getScaleInfo(); // { name: "Major", formula: "<...>", altNames: ["Bilaval theta", "Ethiopian (A raray)", "Ionian", "Mela Dhirasankarabharana (29)", ]}const chord = new Chord("C", "m");
// or
const chord = Chord.fromString("Cm");
chord.getNotes(); // ["C4", "Eb4", "G4"]