@typedin/music-utilities/dist/keys/index.js

A set of resources and modules I use to develop music applications.

import { ModeEnum } from "../constants.js";
import { MajorSixth } from "../interval-builders/Sixth.js";
import { MinorThird } from "../interval-builders/Third.js";
export function getRelativeKey(aTonality) {
    const { name, alteration } = aTonality.mode == ModeEnum.M
        ? MajorSixth({
            name: aTonality.tonality,
            alteration: aTonality.alteration,
            octave: 1,
        })
        : MinorThird({
            name: aTonality.tonality,
            alteration: aTonality.alteration,
            octave: 1,
        });
    return {
        tonality: name,
        alteration,
        mode: aTonality.mode === ModeEnum.M ? ModeEnum.m : ModeEnum.M,
    };
}
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