12:14:18:21: Difference between revisions

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-{{Infobox Chord|12:14:18:21|Name=Swiss tetrad}}
+{{Infobox Chord|Name=subminor seventh,septimal minor seventh}}
-The '''swiss tetrad''' is a just 7-prime-limit, 9-odd-limit chord which is an [[anomalous saturated suspension]]. In close position, it is [[unison|1]]-[[7/6]]-[[3/2]]-[[7/4]] (12:14:18:21), with steps 7/6-9/7-7/6-8/7. Tempered versions of it have been called "subminor seventh chords" or "swiss sixth chords", so "swiss tetrad" splits the difference.
+'''12:14:18:21''', a ''subminor seventh chord'' or ''septimal minor seventh chord'', is an [[anomalous saturated suspension]] in the [[9-odd-limit]].
+<!-- Note: This was at one point labeled a “Swiss tetrad”, seemingly due to a mistaken identification of the “Swiss sixth chord”. [[User:Bcmills]] doesn't see how it would actually relate to the Swiss sixth, which can be represented in 5-limit JI as [[256:320:375:450]] and seems closer to a dominant seventh than a subminor one. -->
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 ! Ratio
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 [[Category:Tetrads]]
 [[Category:Listen]]
+[[Category:Minor seventh chords]]