Getting a diatonic chord sequence starting from a given note

[ghost]

Is there any easy way to get chord tones for a diatonic chord sequence from a given note? Meaning that for C major starting on C4, I would want:

[[C4, E4, G4], ...[G4, B4, D5], ...]

Currently I have something like this:

const CHORDS = Key.majorKey('C')
  .chords.map((chord: string) => Chord.get(chord).notes.slice(0, 3))
  .map((chordNotes: string[]) => chordNotes.map(note => `${note}4`));

but that just gives all the notes in the range of C4 - B4. Great library by the way!

[danigb]

It's true, not obvious 🤔 You can pass a number to the majorKey function:

Key.majorKey('g4').chords.map(chord => Chord.get(chord).notes.slice(0,3))
[
  [ 'G4', 'B4', 'D5' ],
  [ 'A4', 'C5', 'E5' ],
  [ 'B4', 'D5', 'F#5' ],
  [ 'C5', 'E5', 'G5' ],
  [ 'D57', 'F#57', 'A57' ],
  [ 'E5', 'G5', 'B5' ],
  [ 'F#5', 'A5', 'C6' ]
]

But there's a problem with the dominant. Keep this issue open until I solve it