Instead of starting from a blank page, compose from the suggestion of a moron

composing-moron.mjs

/** @prettier */
"use strict";
// Usage:  node composing-moron.mjs

const notes = [
	"A ",
	"B♭",
	"B ",
	"C ",
	"D♭",
	"D ",
	"E♭",
	"E ",
	"F ",
	"G♭",
	"G ",
	"A♭",
];
const chordTypes = ["Maj ", "min ", "dim ", "aug ", "sus4", "sus2"];
const additions = ["+M6", "+m6", "+M7", "+m7"];
const melodicDevices = [
	"passing note",
	"appogiatura",
	"suspension",
	"escapada",
	"bordadura",
	"trill",
	"gruppeto",
	"acciacatura",
	"dotted rhythm",
	"staccato",
	"step",
	"skip",
	"leap",
	"inversion",
	"syncopation",
	"hemiola",
];
const compositionalDevices = [
	"ostinato",
	"contrary motion",
	"parallel motion",
	"oblique motion",
	"ground bass",
	"variation",
	"sequence",
	"imitation",
	"fugue",
	"pedal",
	"counter melody",
	"call and response",
];
const instruments = [
	"recorder",
	"flute",
	"clarinet",
	"oboe",
	"bassoon",
	"trumpet",
	"horn",
	"trombone",
	"tuba",
	"timpani",
	"vibraphone",
	"xylophone",
	"glockenspiel",
	"celesta",
	"piano",
	"electric piano",
	"high strings",
	"low strings",
	"guitar",
	"banjo",
	"harmonica",
	"whistle",
	"snare",
	"triangle",
	"cymbals",
	"bongos",
	"synth",
	"pad",
	"lead",
	"drumset",
	"voice",
	"ondes martenot",
	"theremin",
];

function choice(array) {
	return array[Math.floor(Math.random() * array.length)];
}

export function getRandomChord() {
	return [
		choice(notes),
		choice(chordTypes),
		choice(additions),
		"/",
		choice(notes),
	];
}

console.log("This section could have:");
console.log("Device:         ", choice(compositionalDevices));
console.log("Main line:      ", choice(instruments));
console.log("Secondary line: ", choice(instruments));
console.log("Accompaniment:  ", choice(instruments));
console.log("\n");
console.log("Weird chord progression for you to change until you like it:");
for (var i = 0; i < 20; i++) {
	console.log(getRandomChord().join(" "));
}