256:320:375:450

256:320:375:450 is a chord sometimes called the Swiss sixth.

Chord information

Harmonics	256:320:375:450
Intervals from root	1/1–5/4–375/256–225/128
Cents from root	0¢–386¢–661¢–977¢
Step intervals	5/4, 75/64, 6/5
Step cents	386¢, 275¢, 316¢
Color name	yo Layoyo-6 Latriyopo-5 or y,Lyy6(Ly3p5)
Prime limit	5
Genus	32⋅53 (1125)
Intervallic odd limit	375
Otonal odd limit	375
Utonal odd limit	1125
Consistent edos (d ≥ 2)	22edo*, 31edo*, 49edo*, 53edo*, …
* 2 ≤ d < 4; ** 4 ≤ d < 8; *** 8 ≤ d < 16; …

If 128/125 is tempered out, this chord is tuned identically to both 128:160:192:225 and 20:25:30:36, giving it a function similar to a dominant seventh chord.

See also

• Dreading the Augmented Sixth in The Boston Musical Intelligencer
• Augmented Sixth Chords by Dr. Justin Henry Rubin