40/21: Difference between revisions
No edit summary |
Rewrite. De-highlight "septimal diminished octave" as major sources agree this is a major seventh |
||
| (16 intermediate revisions by 6 users not shown) | |||
| Line 1: | Line 1: | ||
{{Infobox Interval | {{Infobox Interval | ||
| Name = septimal acute major seventh, aberschismic major seventh | |||
| Color name = ry7, ruyo 7th | |||
| Name = | |||
| Color name = | |||
| Sound = jid_40_21_pluck_adu_dr220.mp3 | | Sound = jid_40_21_pluck_adu_dr220.mp3 | ||
}} | }} | ||
'''40/21''', conventionally known as the '''septimal acute major seventh''', is an interval in [[7-limit]] [[just intonation]] measuring about 1115.5 [[cent]]s. Despite being approximated by the diminished octave in systems like septimal [[meantone]], and even being called the ''septimal diminished octave'' by some musicians due to analogy with [[21/20]] being called the "septimal chromatic semitone", 40/21 functions as a major seventh, as is supported by [[Sagittal notation]], [[Helmholtz–Ellis notation]] and [[Functional Just System]], viewed as the [[243/128|Pythagorean major seventh (243/128)]] altered by an [[aberschisma]]. This gives rise to the more precise name '''aberschismic major seventh'''. | |||
== Approximation == | |||
{{Interval edo approximation|40/21}} | |||
[[ | == See also == | ||
[[ | * [[21/20]] – its [[octave complement]] | ||
[[Category: | * [[Gallery of just intervals]] | ||
[[Category:Seventh]] | |||
[[Category:Major seventh]] | |||