Extended meantone notation: Difference between revisions

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Most musicians are familiar with the [[circle of fifths]]. This is a way of organizing and showing relationships between pitches as a sequence of [[3/2|fifths]], and applies to any tuning system that can be generated by fifths and octaves. The generalized chain of fifths involves the 7 base note letters of the C major scale, along with sharps, double-sharps, flats, and double-flats (and beyond):
[[Meantone]] can be notated with a [[chain of fifths]] consisting of the 7 natural notes along with sharps and flats:


... {{dash|F𝄫, C𝄫, G𝄫, D𝄫, A𝄫, E𝄫, B𝄫, F♭, C♭, G♭, D♭, A♭, E♭, B♭, F, C, G, D, A, E, B, F♯, C♯, G♯, D♯, A♯, E♯, B♯, F𝄪, C𝄪, G𝄪, D𝄪, A𝄪, E𝄪, B𝄪|s=thin|d=long}} ...
... {{dash|F𝄫, C𝄫, G𝄫, D𝄫, A𝄫, E𝄫, B𝄫, F♭, C♭, G♭, D♭, A♭, E♭, B♭, F, C, G, D, A, E, B, F♯, C♯, G♯, D♯, A♯, E♯, B♯, F𝄪, C𝄪, G𝄪, D𝄪, A𝄪, E𝄪, B𝄪|hair|long}} ...


In a general meantone tuning, a sharp is split into 2 different parts, the diesis and the kleisma.
The chain is theoretically infinite, and C♯ and D♭ are not (in general) equivalent. When meantone is extended beyond 12 notes, it may require double-sharps, double-flats, and beyond. To avoid this, two new accidental pairs are introduced that raise/lower by the [[diesis]] and the [[kleisma]].
 
== Generalizing accidentals ==
Most musicians are familiar with single and double sharps and flats&mdash;these denote raising and lowering by one or two chromatic semitones, respectively. In a general meantone tuning, there are two additional intervals: the diesis, which is the difference between adjacent accidentals (e.g. C&#x266F;&ndash;D&#x266D; and D&#x266F;&ndash;E&#x266D;),<ref group="note" name="diesis_note">Having C&#x266F; and D&#x266D; be enharmonically equivalent is what most musicians would expect, but this is only true in equal temperament tunings where the number of notes is a multiple of 12. In most tuning systems, there are no enharmonic equivalents involving only sharps and flats.</ref> and the kleisma, which is the amount by which B&#x266F; exceeds C&#x266D; and E&#x266F; exceeds F&#x266D; (that is, C&#x266D;&#x200A;&ndash;&#x200A;B&#x266F; and F&#x266D;&#x200A;&ndash;&#x200A;E&#x266F;).


{| class="wikitable center-all"
{| class="wikitable center-all"
|-
! colspan="2" | Symbol
! colspan="2" | Symbol
! rowspan="2" | Interval
! colspan="2" rowspan="2" | Interval
! rowspan="2" | Number of<br>fifths
! rowspan="2" | Examples
! rowspan="2" | [[Fifthspan]]
|-
|-
! Raise
! Raise
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| &#x266F;
| &#x266F;
| &#x266D;
| &#x266D;
| Chromatic semitone
| Chromatic<br>semitone
| 7
| Augmented<br>unison (A1)
| C&ndash;C&#x266F;<br>E&#x266D;&ndash;E
| +7
|-
|-
| &uarr;
| &uarr;
| &darr;
| &darr;
| Diesis
| Diesis
| 12
| Diminished 2nd (d2)
| C&#x266F;&ndash;D&#x266D;<br>D&#x266F;&ndash;E
| &minus;12
|-
|-
| +
| +
| &minus;
| &minus;
| Kleisma
| Kleisma
| 19
| [[Negative interval|Negative]] double-<br>diminished 2nd (-dd2)
| C&#x266D;&#x200A;&ndash;&#x200A;B&#x266F;<br>F&#x266D;&#x200A;&ndash;&#x200A;E&#x266F;
| +19
|}
|}


A meantone chromatic semitone consists of one diesis and one kleisma. The diesis represents the [[just intonation|just]] intervals [[128/125]] and [[648/625]], while the meantone kleisma represents [[15625/15552]] or [[3125/3072]]. In [[septimal meantone]], where 7/4 is an augmented sixth, the diesis also represents [[36/35]], [[50/49]], and [[64/63]], while the kleisma also represents [[49/48]] and [[245/243]].
Because {{nowrap|19 &minus; 12 {{=}} 7}}, {{nowrap|d2 + &minus;dd2 {{=}} A1}}, and a diesis plus a kleisma equals a chromatic semitone.
 
An octave is made up of:
 
* 7 diatonic semitones and 5 chromatic semitones {{nowrap|{{=}} 7 m2 + 5 A1}} {{nowrap|{{=}} 12 steps}}
* 12 chromatic semitones and 7 dieses {{nowrap|{{=}} 12 A1 + 7 d2}} {{nowrap|{{=}} 19 steps}}
* 19 dieses and 12 kleismas {{nowrap|{{=}} 19 d2 + 12 &minus;dd2}} {{nowrap|{{=}} 31 steps}}
 
The diesis represents the [[just intonation|just]] intervals [[128/125]] and [[648/625]] among others, while the meantone kleisma represents [[15625/15552]] = [-6 -5 6⟩ and [[3125/3072]] = [-10 -1 5⟩ among others. In [[septimal meantone]], where 7/4 is an augmented sixth, the diesis also represents [[36/35]], [[50/49]], and [[64/63]], while the kleisma also represents [[49/48]] and [[245/243]].
 
The [[Enharmonic unison|enharmonic unisons]] &darr;d2 and &minus;&darr;A1 create various notational equivalences:
 
* B&#x266F;&uarr; and B&#x1D12A;&minus; are equal to C
* C+&uarr; is equal to C&#x266F; (because the two semisharps add up)
* D&#x1D12B;&darr; and D&#x266D;&#x266D;&#x266D;&minus; are equal to C


An octave is made of 19 dieses and 12 kleismas.
If the fifth is wider than {{nowrap|7\12 {{=}} 700{{c}}}}, C&#x266F; is higher in pitch than D&#x266D; and the diesis becomes a descending pythagorean comma. In 12edo, the tempering out of the diesis means that  {{nowrap|C&#x266F; {{=}} D&#x266D;}}.  


Unlike semisharps and semiflats, the diesis and kleisma can be generalized to other tunings:
If the fifth is narrower than 11\19 = ~695¢, B&#x266F; is lower in pitch than C&#x266D; and the kleisma becomes a descending double-diminished 2nd. In 19edo, the tempering out of the kleisma means that {{nowrap|B&#x266F; {{=}} C&#x266D;}}.


{| class="wikitable center-all"
{| class="wikitable center-all"
! rowspan="2" | Notes per octave
|+ style="font-size: 105%;" | Various EDOs that support meantone
! rowspan="2" | Approximate<br>[[81/80|syntonic<br>comma]]<br>fraction
|-
! rowspan="3" | [[EDO]]
! rowspan="3" | Approximate<br />[[81/80|syntonic<br />comma]]<br />fraction
! colspan="4" | Steps
! colspan="4" | Steps
! rowspan="2" | Explanation
! rowspan="3" | Relative sizes of the<br />chromatic semitone,<br />diesis, and kleisma
|-
|-
! style="width: 90px;" | Chromatic<br>semitone<br>(e.g.&nbsp;C&ndash;C&#x266F;)
! style="width: 90px;" | Chromatic<br>semitone
! style="width: 90px;" | Diatonic<br>semitone<br>(e.g.&nbsp;C&ndash;D&#x266D;)
! style="width: 90px;" | Diatonic<br>semitone
! Diesis
! Diesis
! Kleisma
! Kleisma
|-
|-
| [[7edo]]
! A1
|
! m2
| 0
! d2
| 1
! &minus;dd2
| 1
| &minus;1
| Chromatic semitone is tempered out<ref group="note" name="chroma_note">In 7-tone equal temperament, the tempering out of the chromatic semitone means that sharps and flats are redundant (in the sense that they cannot alter the pitch).</ref>,<br>diesis is positive, and kleisma is negative<ref group="note" name="kleisma_note">A negative kleisma means that B&#x266F; is lower in pitch than C&#x266D; and E&#x266F; is lower in pitch than F&#x266D;. Conversely, a positive kleisma means B&#x266F; sits higher than C&#x266D; and E&#x266F; sits higher than F&#x266D;. In 19-tone equal temperament, the tempering out of the kleisma means that B&#x266F; = C&#x266D; and E&#x266F; = F&#x266D;.</ref>
|-
|-
| [[12edo|12edo<br>(standard tuning)]]
| [[12edo]]
| {{frac|11}}&nbsp;comma
| {{frac|11}}&nbsp;comma
| 1
| 1
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| 0
| 0
| 1
| 1
| Chromatic semitone is equal to kleisma,<br>diesis is tempered out<ref group="note" name="diesis_note" />
| Chromatic semitone is equal to kleisma,<br />diesis is tempered out
|-
|-
| [[19edo]]
| [[19edo]]
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| 1
| 1
| 0
| 0
| Chromatic semitone is equal to diesis,<br>kleisma is tempered out<ref group="note" name="kleisma_note" />
| Chromatic semitone is equal to diesis,<br />kleisma is tempered out
|-
|-
| [[26edo]]
| [[26edo]]
|  
|
| 1
| 1
| 3
| 3
| 2
| 2
| &minus;1
| &minus;1
| rowspan="2" | Chromatic semitone is smaller than diesis,<br>kleisma is negative<ref group="note" name="kleisma_note" />
| Chromatic semitone is smaller than diesis,<br />kleisma is negative
|-
| [[33edo#Theory|33edo]]<br>(c&nbsp;mapping)
| {{frac|2}}&nbsp;comma
| 1
| 4
| 3
| &minus;2
|-
|-
| [[31edo]]
| [[31edo]]
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| 1
| 1
| Diesis is equal to kleisma
| Diesis is equal to kleisma
|-
| [[33edo#Theory|33c-edo]]
| {{frac|2}}&nbsp;comma
| 1
| 4
| 3
| &minus;2
| Chromatic semitone is smaller than diesis,<br />kleisma is negative
|-
|-
| [[43edo]]
| [[43edo]]
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|}
|}


There are of course notational equivalences:
In 33c-edo, 5/4 is mapped to {{nowrap|10\33 {{=}} 364{{c}}}} instead of {{nowrap|11\33 {{=}} 400{{c}}}}.
 
* B&#x266F;&uarr; and B&#x1D12A;&minus; are equal to C
* C+&uarr; is equal to C&#x266F; (because the two semisharps add up)
* D&#x1D12B;&darr; and D&#x266D;&#x266D;&#x266D;&minus; are equal to C


[[9–odd–limit]] intervals and their notation relative to C:
[[9-odd-limit]] intervals and their notation relative to C:


{| class="wikitable center-all"
{| class="wikitable center-all"
|-
! Note
! Note
| C
| C
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| E&#x266D;
| E&#x266D;
| A&#x266D;
| A&#x266D;
| style="border-left: 5px solid black;" | A&#x266F;<br>B&#x266D;&darr;
| style="border-left: 5px solid black;" | A&#x266F; <br />B&#x266D;&darr;
| D&#x266F;<br>E&#x266D;&darr;
| D&#x266F;<br />E&#x266D;&darr;
| F&#x266F;<br>G&#x266D;&darr;
| F&#x266F;<br />G&#x266D;&darr;
| E&#x1D12B;<br>D&darr;
| E<br>D&darr;
| B&#x1D12B;<br>A&darr;
| B<br>A&darr;
| G&#x266D;<br>F&#x266F;&darr;
| G&#x266D;<br />F&#x266F;&darr;
| colspan="2" style="border-left: 5px solid black;" | D
| colspan="2" style="border-left: 5px solid black;" | D
| colspan="2" | B&#x266D;
| colspan="2" | B&#x266D;
| F&#x266D;<br>E&uarr;
| F&#x266D;<br />E&uarr;
| G&#x266F;<br>A&#x266D;&darr;
| G&#x266F; <br />A&#x266D;&darr;
|-
|-
! Just interval
! Just interval
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== True half-sharps and half-flats ==
== True half-sharps and half-flats ==
If sharps raise by an even number of steps, such as [[24-tone equal temperament]] (quarter tones) and [[31-tone equal temperament]] (extended [[quarter-comma meantone]]), they (along with flats) can be split in half. Thus, some notes can be notated using semisharps and semiflats, or with [[ups and downs notation|ups and downs]].
If sharps raise by an even number of edosteps, such as [[24-tone equal temperament]] (quarter tones) and [[31-tone equal temperament]] (approximately extended [[quarter-comma meantone]]), they (along with flats) can be split in half. Thus, some notes can be notated using semisharps and semiflats, or with [[ups and downs notation|ups and downs]].


For example, in 31 equal, the chromatic scale becomes:
For example, in 31 equal, the chromatic scale becomes:


{{dash|C, D&#x1D12B;, C&#x266F;, D&#x266D;, C&#x1D12A;, D, E&#x1D12B;, D&#x266F;, E&#x266D;, D&#x1D12A;, E, F&#x266D;, E&#x266F;, F, G&#x1D12B;, F&#x266F;, G&#x266D;, F&#x1D12A;, G, A&#x1D12B;, G&#x266F;, A&#x266D;, G&#x1D12A;, A, B&#x1D12B;, A&#x266F;, B&#x266D;, A&#x1D12A;, B, C&#x266D;, B&#x266F;, C|s=thin|d=long}}
{{dash|C, D&#x1D12B;, C&#x266F;, D&#x266D;, C&#x1D12A;, D, E&#x1D12B;, D&#x266F;, E&#x266D;, D&#x1D12A;, E, F&#x266D;, E&#x266F;, F, G&#x1D12B;, F&#x266F;, G&#x266D;, F&#x1D12A;, G, A&#x1D12B;, G&#x266F;, A&#x266D;, G&#x1D12A;, A, B&#x1D12B;, A&#x266F;, B&#x266D;, A&#x1D12A;, B, C&#x266D;, B&#x266F;, C|hair|long}}


Note that the base note letters alternate.
Note that the base note letters alternate.
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Using semisharps and semiflats, this can be re-written as:
Using semisharps and semiflats, this can be re-written as:


{{dash|C, C{{demisharp2}}, C&#x266F;, D&#x266D;, D{{demiflat2}}, D, D{{demisharp2}}, D&#x266F;, E&#x266D;, E{{demiflat2}}, E, E{{demisharp2}}, F{{demiflat2}}, F, F{{demisharp2}}, F&#x266F;, G&#x266D;, G{{demiflat2}}, G, G{{demisharp2}}, G&#x266F;, A&#x266D;, A{{demiflat2}}, A, A{{demisharp2}}, A&#x266F;, B&#x266D;, B{{demiflat2}}, B, B{{demisharp2}}, C{{demiflat2}}, C|s=thin|d=long}}
{{dash|C, C{{demisharp2}}, C&#x266F;, D&#x266D;, D{{demiflat2}}, D, D{{demisharp2}}, D&#x266F;, E&#x266D;, E{{demiflat2}}, E, E{{demisharp2}}, F{{demiflat2}}, F, F{{demisharp2}}, F&#x266F;, G&#x266D;, G{{demiflat2}}, G, G{{demisharp2}}, G&#x266F;, A&#x266D;, A{{demiflat2}}, A, A{{demisharp2}}, A&#x266F;, B&#x266D;, B{{demiflat2}}, B, B{{demisharp2}}, C{{demiflat2}}, C|hair|long}}
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If true half-sharps and true half-flats are desired, which exactly bisect the chromatic semitone, the meantone fifth is split in half. This creates a new tuning system consisting of a two-dimensional lattice generated by a chain of neutral thirds, with meantone existing as every other note in the generator chain. This adds true half-sharps and half-flats, and creates a "neutral" version of each interval class.
If true half-sharps and true half-flats are desired, which exactly bisect the chromatic semitone, the meantone fifth is split in half. This creates a new tuning system consisting of a two-dimensional lattice generated by a chain of neutral thirds, with meantone existing as every other note in the generator chain. This adds true half-sharps and half-flats, and creates a "neutral" version of each interval class.
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== Notes ==
{{Navbox notation}}
<references group="note" />


[[Category:Meantone]]
[[Category:Meantone]]
[[Category:Notation]]
[[Category:Notation]]