Generating combinations of Major/minor chord progressions with JavaScript

all-chord-progressions.md

minor → minor

C D♯ G → C♯ E G♯

C D♯ G → D F A

C D♯ G → D♯ F♯ A♯

C D♯ G → E G B

C D♯ G → F G♯ C

C D♯ G → F♯ A C♯

C D♯ G → G A♯ D

C D♯ G → G♯ B D♯

C D♯ G → A C E

C D♯ G → A♯ C♯ F

C D♯ G → B D F♯

Major → minor

C E G → C♯ E G♯

C E G → D F A

C E G → D♯ F♯ A♯

C E G → E G B

C E G → F G♯ C

C E G → F♯ A C♯

C E G → G A♯ D

C E G → G♯ B D♯

C E G → A C E

C E G → A♯ C♯ F

C E G → B D F♯

minor → Major

C D♯ G → C♯ F G♯

C D♯ G → D F♯ A

C D♯ G → D♯ G A♯

C D♯ G → E G♯ B

C D♯ G → F A C

C D♯ G → F♯ A♯ C♯

C D♯ G → G B D

C D♯ G → G♯ C D♯

C D♯ G → A C♯ E

C D♯ G → A♯ D F

C D♯ G → B D♯ F♯

Major → Major

C E G → C♯ F G♯

C E G → D F♯ A

C E G → D♯ G A♯

C E G → E G♯ B

C E G → F A C

C E G → F♯ A♯ C♯

C E G → G B D

C E G → G♯ C D♯

C E G → A C♯ E

C E G → A♯ D F

C E G → B D♯ F♯

generating-chord-progressions.js

const scale = [
  ['c-0', 16.35],
  ['c-s-0', 17.32],
  ['d-0', 18.35],
  ['d-s-0', 19.45],
  ['e-0', 20.6],
  ['f-0', 21.83],
  ['f-s-0', 23.12],
  ['g-0', 24.5],
  ['g-s-0', 25.96],
  ['a-0', 27.5],
  ['a-s-0', 29.14],
  ['b-0', 30.87],
  ['c-1', 32.7],
  ['c-s-1', 34.65],
  ['d-1', 36.71],
  ['d-s-1', 38.89],
  ['e-1', 41.2],
  ['f-1', 43.65],
  ['f-s-1', 46.25],
  ['g-1', 49],
  ['g-s-1', 51.91],
  ['a-1', 55],
  ['a-s-1', 58.27],
  ['b-1', 61.74],
  ['c-2', 65.41],
  ['c-s-2', 69.3],
  ['d-2', 73.42],
  ['d-s-2', 77.78],
  ['e-2', 82.41],
  ['f-2', 87.31],
  ['f-s-2', 92.5],
  ['g-2', 98],
  ['g-s-2', 103.83],
  ['a-2', 110],
  ['a-s-2', 116.54],
  ['b-2', 123.47],
  ['c-3', 130.81],
  ['c-s-3', 138.59],
  ['d-3', 146.83],
  ['d-s-3', 155.56],
  ['e-3', 164.81],
  ['f-3', 174.61],
  ['f-s-3', 185],
  ['g-3', 196],
  ['g-s-3', 207.65],
  ['a-3', 220],
  ['a-s-3', 233.08],
  ['b-3', 246.94],
  ['c-4', 261.63],
  ['c-s-4', 277.18],
  ['d-4', 293.66],
  ['d-s-4', 311.13],
  ['e-4', 329.63],
  ['f-4', 349.23],
  ['f-s-4', 369.99],
  ['g-4', 392],
  ['g-s-4', 415.3],
  ['a-4', 440],
  ['a-s-4', 466.16],
  ['b-4', 493.88],
  ['c-5', 523.25],
  ['c-s-5', 554.37],
  ['d-5', 587.33],
  ['d-s-5', 622.25],
  ['e-5', 659.25],
  ['f-5', 698.46],
  ['f-s-5', 739.99],
  ['g-5', 783.99],
  ['g-s-5', 830.61],
  ['a-5', 880],
  ['a-s-5', 932.33],
  ['b-5', 987.77],
  ['c-6', 1046.5],
  ['c-s-6', 1108.73],
  ['d-6', 1174.66],
  ['d-s-6', 1244.51],
  ['e-6', 1318.51],
  ['f-6', 1396.91],
  ['f-s-6', 1479.98],
  ['g-6', 1567.98],
  ['g-s-6', 1661.22],
  ['a-6', 1760],
  ['a-s-6', 1864.66],
  ['b-6', 1975.53],
  ['c-7', 2093],
  ['c-s-7', 2217.46],
  ['d-7', 2349.32],
  ['d-s-7', 2489.02],
  ['e-7', 2637.02],
  ['f-7', 2793.83],
  ['f-s-7', 2959.96],
  ['g-7', 3135.96],
  ['g-s-7', 3322.44],
  ['a-7', 3520],
  ['a-s-7', 3729.31],
  ['b-7', 3951.07],
  ['c-8', 4186.01],
  ['c-s-8', 4434.92],
  ['d-8', 4698.63],
  ['d-s-8', 4978.03],
  ['e-8', 5274.04],
  ['f-8', 5587.65],
  ['f-s-8', 5919.91],
  ['g-8', 6271.93],
  ['g-s-8', 6644.88],
  ['a-8', 7040],
  ['a-s-8', 7458.62],
  ['b-8', 7902.13]
]

const chord = {
  Major: root => [scale[root], scale[root + 4], scale[root + 7]],
  minor: root => [scale[root], scale[root + 3], scale[root + 7]]
}

const rootNote = string => scale.findIndex(([name, freq]) => name === string)
const nameOnly = ([name, freq]) => name.toUpperCase().replace('-S', '♯').replace(/-\d/, '')
const freqOnly = ([name, freq]) => freq

const variations = [
  ['minor', 'minor'],
  ['Major', 'minor'],
  ['minor', 'Major'],
  ['Major', 'Major']
]

// Log minor chord with root of C-4
console.log(
  chord.minor(rootNote('c-4'))
)

// Log all possible chord progressions
console.log(
  variations.map(([first, second]) => {
    let chords = []
    for (let offset = 1; offset < 12; offset++) {
      chords.push([
        chord[first](rootNote('c-4')),
        chord[second](rootNote('c-4') + offset)
      ])
    }
    return `# ${first} → ${second}\n\n${
      chords
        .map(([start, end]) => `${start.map(nameOnly).join(' ')} → ${end.map(nameOnly).join(' ')}`)
        .join('\n\n')
    }\n\n`
  })
  .join('')
)