A quick Node script for generating a couple MIDI files that make a tune, together.

tune.js

const {
  clip,
  scale,
  midi,
  arp,
  getChordsByProgression
} = require('scribbletune')


const progression = getChordsByProgression('d2 major', 'I VI ii V')
const lowerProgression = getChordsByProgression('d1 major', 'I VI ii V')
const arpNotes = arp({
  chords: progression,
  order: '0121'
})

const chords = clip({
  notes: progression,
  pattern: 'x__-x__-x__-x__'
})

const arpeggios = clip({
  notes: arpNotes,
  pattern: 'xxxx'.repeat(4)
})


// I kept rerunning this script to generate
// new melodic patterns and just concatenated
// each new melody together to get the melody in the final sound
const melody = clip({
  notes: scale('d4 major'),
  pattern: 'xxx[xx]--xx'.repeat(8),
  shuffle: true,
})

midi(chords, 'chords.mid')
midi(arpeggios, 'arpeggios.mid')
midi(melody, 'melody.mid')