19edo chords

In contrast to 12edo chords, 19edo has four instead of the usual two main tertian chord qualities which opens up completely new territory for eager musicians/microtonalists to explore.

19edo approximates intervals with factors of 2 (2/1), 3 (3/2), 5 (5/4, 5/3, 6/5) and 7 (7/6, 7/4, 27/14) quite well. This essentially means that normal chords – like in 12edo – can be represented nicely in 19edo.

Despite that enharmonics work differently in 19edo, pitches can be written down with standard notation.

Triads

Note that the cent values of the intervals are approximated. For detailed numbers, see 19edo.

Chord name	Symbol	Notes	Steps	Cents	Audio
Major	C	C–E–G	0–6–11	0–379–695
Minor	Cm, Cmin	C–E♭–G	0–5–11	0–316–695
Supermajor, Major sharp 3	Csmaj, C(♯3), Cmaj(♯3)	C–E#–G	0–7–11	0–442–695
Subminor, Minor flat 3	Csmin, Cmin(♭3)	C–E𝄫–G	0–4–11	0–253–695
Sus4	Csus4	C–F–G	0–8–11	0–505–695
Sus2	Csus2	C–D–G	0–3–11	0–189–695
Diminished	Cdim, C°	C–E♭–G♭	0–5–10	0–316–632
Augmented	Caug, C+	C–E–G♯	0–6–12	0–379–758

Tetrads (sixth/seventh chords)

Because of interesting new features – the supermajor seventh and "harmonic" seventh/augmented sixth – new tetrads are possible while existing ones can be preserved.

Major chords

Chord name	Symbol	Notes	Steps	Cents	Audio
Major seventh	Cmaj7	C–E–G–B	0–6–11–17	0–379–695–1074
Dominant seventh	C7	C–E–G–B♭	0–6–11–16	0–379–695–1011
Harmonic seventh	Ch7	C–E–G–B𝄫	0–6–11–15	0–379–695–947
Sixth	C6	C–E–G–A	0–6–11–14	0–379–695–884

Minor chords

Chord name	Symbol	Steps	Cents	Audio
Minor seventh	Cm7	0-5-11-16	0-316-695-1011
Minor major seventh	Cmmaj7	0-5-11-17	0-316-695-1074
Minor augmented six	Cm+6	0-5-11-15	0-316-695-947
Minor six	Cm6	0-5-11-14	0-316-695-884
Minor seven flat six (NT aeolian seven)	Cm7(♭6) [Faeol7]	0-5-13-16	0-316-821-1011

Supermajor chords

Chord name	Symbol	Steps	Cents	Audio
Supermajor seventh	Csmaj7, Cmaj7(♯3, ♯7)	0-7-11-18	0-442-695-1137

Subminor chords

Chord name	Symbol	Steps	Cents	Audio
Subminor seventh	Csmin7, Cmin7(♭3, ♭7)	0-4-11-15	0-253-695-947

Diminished chords

Chord name	Symbol	Steps	Cents	Audio
Diminished seven (fully diminished)	Cdim7, C°7	0-5-10-15	0-316-632-947
Minor seven flat five (half-diminished)	Cm7(♭5), Cø7	0-5-10-16	0-316-632-1011

Augmented chords

Chord name	Symbol	Steps	Cents	Audio
Augmented seven	Caug7, C+7, C7♯5	0-6-12-16	0-379-758-1011
Major seven sharp five	Cmaj7♯5	0-6-12-18	0-379-758-1137

Pentads (ninth chords)

Major chords

Chord name	Symbol	Steps	Cents	Audio
Major ninth	Cmaj9	0-6-11-17-22	0-379-695-1074-1389
Dominant ninth	C9	0-6-11-16-22	0-379-695-1011-1389
Dominant seven flat nine	C7(♭9)	0-6-11-16-21	0-379-695-1011-1326
Harmonic ninth	Ch9	0-6-11-15-22	0-379-695-947-1389
Harmonic seven flat nine	Ch7(♭9)	0-6-11-15-21	0-379-695-947-1326