10:12:15

Chord information
Harmonics	10:12:15
Subharmonics	1/(6:5:4)
Intervals from root	1/1–6/5–3/2
Cents from root	0¢–316¢–702¢
Step intervals	6/5, 5/4
Step cents	316¢, 386¢
Color name	gu or g
Prime limit	5
Genus	3⋅5 (15)
Intervallic odd limit	5
Otonal odd limit	15
Utonal odd limit	5
Consistent edos (d ≥ 2)	3edo, 12edo, 15edo, 19edo*, …
	* 2 ≤ d < 4; 4 ≤ d < 8; * 8 ≤ d < 16; …

10:12:15 is a utonal minor triad, known as the just minor triad, classical minor triad, or Ptolemaic minor triad. It is a common chord that appears as a counterpart to the widespread otonal major triad of 4:5:6, with the major third replaced by a minor third.

Audio of close voicings

10:12:15 Root position

12:15:20 1st inversion

15:20:24 2nd inversion

Notable voicings

Voicings are sorted by Wilson norm. This list is only a brief overview, see Voicings of 10:12:15 for a more comprehensive list.


Voices	EFR	Hi-lo name	Special properties
3 voices	3:5:15	lo3hi5	AOV (all-odd voicing)
	6:10:15	lo3	CAOV (condensed AOV)
	10:12:15	basic
	10:15:24	hi3
	12:15:20	hiR	1st inversion
	15:20:24	lo5	2nd inversion
4 voices	10:12:15:20	add8
4 voices	10:15:20:24	hi3add8

Related chords

Melodic inversion: 4:5:6.

Plausible homonyms: 12:15:20 (1/1 - 5/4 - 5/3), a maj6no5 chord.

Notable extensions (5-limit except where noted):

10:12:15:18 adds 9/5
30:36:45:50 adds 5/3
70:84:105:120 (1/(12:10:8:7)) – adds 12/7 (7-limit)
60:70:84:105 (1/(7:6:5:4)) – a homonym of the previous chord