make install

$ music-theory chord "Cm nondominant -5 679"
root: C
tones:
  3: D#
  6: A
  7: A#
  9: D

$ music-theory chords
- Basic
- Nondominant
- Major Triad
- Minor Triad
- Augmented Triad
- Diminished Triad
- Suspended Triad
- Omit Fifth
- Flat Fifth
- Add Sixth
- Augmented Sixth
- Omit Sixth
- Add Seventh
- Dominant Seventh
- Major Seventh
- Minor Seventh
- Diminished Seventh
- Half Diminished Seventh
- Diminished Major Seventh
- Augmented Major Seventh
- Augmented Minor Seventh
- Harmonic Seventh
- Omit Seventh
- Add Ninth
- Dominant Ninth
- Major Ninth
- Minor Ninth
- Sharp Ninth
- Omit Ninth
- Add Eleventh
- Dominant Eleventh
- Major Eleventh
- Minor Eleventh
- Omit Eleventh
- Add Thirteenth
- Dominant Thirteenth
- Major Thirteenth
- Minor Thirteenth

$ music-theory scale "C aug"
root: C
tones:
  1: C
  2: D#
  3: E
  4: G
  5: G#
  6: B

$ music-theory scales
- Default (Major)
- Minor
- Major
- Natural Minor
- Diminished
- Augmented
- Melodic Minor Ascend
- Melodic Minor Descend
- Harmonic Minor
- Ionian
- Dorian
- Phrygian
- Lydian
- Mixolydian
- Aeolian
- Locrian

$ music-theory key Db
root: Db
mode: Major
relative:
  root: Bb
  mode: Minor