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![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Septimal_kleisma.png/220px-Septimal_kleisma.png)
![7 upside-down](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/7_upside_down.png/8px-7_upside_down.png)
In music, the ratio 225/224 is called the septimal kleisma (playⓘ).[1] It is a minute comma type interval of approximately 7.7 cents. Factoring it into primes gives 2−5 32 52 7−1, which can be rewritten 2−1 (5/4)2 (9/7). That says that it is the amount that two major thirds of 5/4 and a septimal major third, or supermajor third, of 9/7 exceeds the octave.
The septimal kleisma can also be viewed as the difference between the diatonic semitone (16:15) and the septimal diatonic semitone (15:14).
References
Twelve- semitone (post-Bach Western) |
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Other tuning systems |
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Other intervals |
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