6:7:9

Chord information
Harmonics	6:7:9
Subharmonics	1/(21:18:14)
Intervals from root	1/1–7/6–3/2
Cents from root	0¢–267¢–702¢
Step intervals	7/6, 9/7
Step cents	267¢, 435¢
Color name	zo or z
Prime limit	7
Genus	32⋅7 (63)
Intervallic odd limit	9
Otonal odd limit	9
Utonal odd limit	21
Consistent edos (d ≥ 2)	5edo, 14edo, 17edo, 19edo, …
	* 2 ≤ d < 4; 4 ≤ d < 8; * 8 ≤ d < 16; …

6:7:9, a subminor triad or septimal minor triad, is a triad in the 7-limit sometimes used in place of a minor triad. This chord is more melancholic than your Pythagorean or pental minor triad.

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Todo: research

This chord may be closely connected to 7-limit interpretations of the Blues scale.