55edo: Difference between revisions

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m Theory: Fix links to Mohajira and Liese
Modern renderings: Add Moart's ''Gigue KV 574 («Leipziger Gigue»)'' (1789) – organ rendition by Claudi Meneghin (2026)
 
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{{interwiki
{{Interwiki
| en = 55edo
| de = 55-EDO
| de = 55-EDO
| en = 55edo
| es = 55 EDO
| es = 55 EDO
| ja =  
| ja =  
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== Theory ==
== Theory ==
55edo can be used for a [[meantone]] tuning, and is close to [[1/6-comma meantone]] (and is almost exactly 10/57-comma meantone). {{w|Georg Philipp Telemann|Telemann}} suggested it as a theoretical basis for analyzing the [[meantone intervals|intervals of meantone]]. {{w|Leopold Mozart|Leopold}} and {{w|Wolfgang Amadeus Mozart|Wolfgang Mozart}} recommended 55edo or something close to it, with a subset and further approximation used for keyboard instruments which (apart from an experimental instrument) did not have enough notes per octave to accommodate it in full.<ref>Chesnut, John (1977) ''Mozart's Teaching of Intonation'', '''Journal of the American Musicological Society''' Vol. 30, No. 2 (Summer, 1977), pp. 254-271 (Published By: University of California Press) [https://doi.org/10.2307/831219 doi.org/10.2307/831219], [http://www.jstor.org/stable/831219 https://www.jstor.org/stable/831219]</ref> It can also be used for [[Meantone_family#Mohajira|Mohajira]] and [[Meantone_family#Liese|Liese]] temperaments. It also supports an extremely sharp tuning of [[huygens|Huygens/undecimal meantone]] using the 55de [[val]], meaning that primes 7 and 11 are mapped very sharply to their second-best mapping.
55edo supports [[meantone]], and is close to [[1/6-comma meantone]]. {{w|Georg Philipp Telemann|Telemann}} suggested it as a theoretical basis for analyzing the [[meantone intervals|intervals of meantone]]. {{w|Leopold Mozart|Leopold}} and {{w|Wolfgang Amadeus Mozart|Wolfgang Mozart}} recommended 55edo or something close to it, with a subset and further approximation used for keyboard instruments which (apart from an experimental instrument) did not have enough notes per octave to accommodate it in full.<ref>Chesnut, John (1977) ''Mozart's Teaching of Intonation'', '''Journal of the American Musicological Society''' Vol. 30, No. 2 (Summer, 1977), pp. 254-271 (Published By: University of California Press) [https://doi.org/10.2307/831219 doi.org/10.2307/831219], [http://www.jstor.org/stable/831219 https://www.jstor.org/stable/831219]</ref> It can also be used for [[mohajira]] and [[liese]] temperaments. It also supports an extremely sharp tuning of [[huygens|huygens/undecimal meantone]] using the 55de [[val]], meaning that primes 7 and 11 are mapped very sharply to their second-best mapping. 55edo is a [[zeta valley edo]], suggesting it does not approximate the harmonic series very well for its size.
 


=== Odd harmonics ===
=== Odd harmonics ===
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=== Subsets and supersets ===
=== Subsets and supersets ===
Since 55 factors into {{factorization|55}}, 55edo contains [[5edo]] and [[11edo]] as its subsets.
Since 55 factors into primes as {{nowrap| 5 × 11 }}, 55edo contains [[5edo]] and [[11edo]] as its subsets.


== Intervals ==
== Intervals ==
{| class="wikitable center-1 right-2 left-3"
{| class="wikitable center-1 right-2 left-3"
|-
|-
! [[Degree|&#35;]]
! [[Degree|#]]
! [[Cent]]s
! [[Cent]]s
! Approximate ratios
! Approximate ratios
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| 0
| 0
| 0.0
| 0.0
| 1/1
| [[1/1]]
| P1
| P1
| perfect 1sn
| perfect 1sn
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| 1
| 1
| 21.8
| 21.8
| 65/64, 78/77, 99/98, ''128/125''
| [[65/64]], [[78/77]], [[99/98]], ''[[128/125]]''
| ^1
| ^1
| up 1sn
| up 1sn
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| 2
| 2
| 43.6
| 43.6
| 36/35, ''64/63''
| [[36/35]], ''[[64/63]]''
| ^^1
| ^^1
| dup 1sn
| dup 1sn
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| 3
| 3
| 65.5
| 65.5
| 28/27
| [[28/27]]
| vvm2
| vvm2
| dudminor 2nd
| dudminor 2nd
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| 4
| 4
| 87.3
| 87.3
| 21/20, ''18/17'', ''25/24''
| [[21/20]], ''[[18/17]]'', ''[[25/24]]''
| vm2
| vm2
| downminor 2nd
| downminor 2nd
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| 5
| 5
| 109.1
| 109.1
| 16/15, 17/16
| [[16/15]], [[17/16]]
| m2
| m2
| minor 2nd
| minor 2nd
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| 6
| 6
| 130.9
| 130.9
| 13/12, 14/13
| [[13/12]], [[14/13]]
| ^m2
| ^m2
| upminor 2nd
| upminor 2nd
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| 7
| 7
| 152.7
| 152.7
| 12/11, ''11/10''
| [[12/11]], ''[[11/10]]''
| ~2
| ~2
| mid 2nd
| mid 2nd
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| 9
| 9
| 196.4
| 196.4
| 9/8, ''10/9''
| [[9/8]], ''[[10/9]]''
| M2
| M2
| major 2nd
| major 2nd
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| 10
| 10
| 218.2
| 218.2
| 17/15
| [[17/15]]
| ^M2
| ^M2
| upmajor 2nd
| upmajor 2nd
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| 11
| 11
| 240.0
| 240.0
| 8/7
| [[8/7]]
| ^^M2
| ^^M2
| dupmajor 2nd
| dupmajor 2nd
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| 12
| 12
| 261.8
| 261.8
| 7/6
| [[7/6]]
| vvm3
| vvm3
| dudminor 3rd
| dudminor 3rd
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| 13
| 13
| 283.6
| 283.6
| 13/11
| [[13/11]]
| vm3
| vm3
| downminor 3rd
| downminor 3rd
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| 14
| 14
| 305.5
| 305.5
| 6/5
| [[6/5]]
| m3
| m3
| minor 3rd
| minor 3rd
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| 16
| 16
| 349.1
| 349.1
| 11/9, 27/22
| [[11/9]], [[27/22]]
| ~3
| ~3
| mid 3rd
| mid 3rd
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| 17
| 17
| 370.9
| 370.9
| 26/21, ''16/13''
| [[26/21]], ''[[16/13]]''
| vM3
| vM3
| downmajor 3rd
| downmajor 3rd
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| 18
| 18
| 392.7
| 392.7
| 5/4
| [[5/4]]
| M3
| M3
| major 3rd
| major 3rd
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| 19
| 19
| 414.5
| 414.5
| 14/11
| [[14/11]]
| ^M3
| ^M3
| upmajor 3rd
| upmajor 3rd
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| 20
| 20
| 436.4
| 436.4
| 9/7
| [[9/7]]
| ^^M3
| ^^M3
| dupmajor 3rd
| dupmajor 3rd
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| 21
| 21
| 458.2
| 458.2
| ''21/16''
| ''[[21/16]]''
| vv4
| vv4
| dud 4th
| dud 4th
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| 23
| 23
| 501.8
| 501.8
| 4/3, ''27/20''
| [[4/3]], ''[[27/20]]''
| P4
| P4
| perfect 4th
| perfect 4th
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| 25
| 25
| 545.5
| 545.5
| 11/8, 15/11
| [[11/8]], [[15/11]]
| ~4
| ~4
| mid 4th
| mid 4th
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| 27
| 27
| 589.1
| 589.1
| 24/17
| [[24/17]]
| A4, vd5
| A4, vd5
| aug 4th, downdim 5th
| aug 4th, downdim 5th
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| 28
| 28
| 610.9
| 610.9
| 17/12
| [[17/12]]
| ^A4, d5
| ^A4, d5
| upaug 4th, dim 5th
| upaug 4th, dim 5th
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| 30
| 30
| 654.5
| 654.5
| 16/11, 22/15
| [[16/11]], [[22/15]]
| ~5
| ~5
| mid 5th
| mid 5th
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| 32
| 32
| 698.2
| 698.2
| 3/2, ''40/27''
| [[3/2]], ''[[40/27]]''
| P5
| P5
| perfect 5th
| perfect 5th
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| 34
| 34
| 741.8
| 741.8
| ''32/21''
| ''[[32/21]]''
| ^^5
| ^^5
| dup 5th
| dup 5th
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| 35
| 35
| 763.6
| 763.6
| 14/9
| [[14/9]]
| vvm6
| vvm6
| dudminor 6th
| dudminor 6th
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| 36
| 36
| 785.5
| 785.5
| 11/7
| [[11/7]]
| vm6
| vm6
| downminor 6th
| downminor 6th
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| 37
| 37
| 807.3
| 807.3
| 8/5
| [[8/5]]
| m6
| m6
| minor 6th
| minor 6th
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| 38
| 38
| 829.1
| 829.1
| 21/13, ''13/8''
| [[21/13]], ''[[13/8]]''
| ^m6
| ^m6
| upminor 6th
| upminor 6th
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| 39
| 39
| 850.9
| 850.9
| 18/11, 44/27
| [[18/11]], [[44/27]]
| ~6
| ~6
| mid 6th
| mid 6th
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| 41
| 41
| 894.5
| 894.5
| 5/3
| [[5/3]]
| M6
| M6
| major 6th
| major 6th
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| 42
| 42
| 916.4
| 916.4
| 22/13
| [[22/13]]
| ^M6
| ^M6
| upmajor 6th
| upmajor 6th
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| 43
| 43
| 938.2
| 938.2
| 12/7
| [[12/7]]
| ^^M6
| ^^M6
| dupmajor 6th
| dupmajor 6th
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| 44
| 44
| 960.0
| 960.0
| 7/4
| [[7/4]]
| vvm7
| vvm7
| dudminor 7th
| dudminor 7th
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| 45
| 45
| 981.8
| 981.8
| 30/17
| [[30/17]]
| vm7
| vm7
| downminor 7th
| downminor 7th
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| 46
| 46
| 1003.6
| 1003.6
| 16/9, ''9/5''
| [[16/9]], ''[[9/5]]''
| m7
| m7
| minor 7th
| minor 7th
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| 48
| 48
| 1047.3
| 1047.3
| 11/6, ''20/11''
| [[11/6]], ''[[20/11]]''
| ~7
| ~7
| mid 7th
| mid 7th
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| 49
| 49
| 1069.1
| 1069.1
| 13/7, 24/13
| [[13/7]], [[24/13]]
| vM7
| vM7
| downmajor 7th
| downmajor 7th
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| 50
| 50
| 1090.9
| 1090.9
| 15/8, ''32/17''
| [[15/8]], ''[[32/17]]''
| M7
| M7
| major 7th
| major 7th
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| 51
| 51
| 1112.7
| 1112.7
| 40/21, ''17/9'', ''48/25''
| [[40/21]], ''[[17/9]]'', ''[[48/25]]''
| ^M7
| ^M7
| upmajor 7th
| upmajor 7th
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| 52
| 52
| 1134.5
| 1134.5
| 56/27
| [[56/27]]
| ^^M7
| ^^M7
| dupmajor 7th
| dupmajor 7th
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| 53
| 53
| 1156.4
| 1156.4
| 35/18, ''63/32''
| [[35/18]], ''[[63/32]]''
| vv8
| vv8
| dud 8ve
| dud 8ve
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| 54
| 54
| 1178.2
| 1178.2
| 128/65, 77/39, 196/99, ''125/64''
| [[128/65]], [[77/39]], [[196/99]], ''[[125/64]]''
| v8
| v8
| down 8ve
| down 8ve
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| 55
| 55
| 1200.0
| 1200.0
| 2/1
| [[2/1]]
| P8
| P8
| perfect 8ve
| perfect 8ve
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== Notation ==
== Notation ==
=== Ups and downs notation ===
=== Stein–Zimmermann–Gould notation ===
55edo can be notated with [[ups and downs]], spoken as up, dup, downsharp, sharp, upsharp etc. and down, dud, upflat etc. Note that dup is equivalent to dudsharp and dud is equivalent to dupflat.
[[Stein–Zimmermann–Gould notation]] uses sharps and flats combined with quartertone accidentals and arrows:
{{Sharpness-sharp4a}}
{{Sharpness-sharp4-szg}}
[[Alternative symbols for ups and downs notation]] uses sharps and flats with arrows, borrowed from extended [[Helmholtz–Ellis notation]]:
 
{{Sharpness-sharp4}}
=== Kite's ups and downs notation ===
55edo can also be notated with [[Kite's ups and downs notation|Kite's ups and downs]], spoken as up, dup, downsharp, sharp, upsharp etc. and down, dud, upflat etc. Note that dup is equivalent to dudsharp and dud is equivalent to dupflat.
{{Ups and downs sharpness}}
 
=== Sagittal notation ===
=== Sagittal notation ===
==== Evo flavor ====
==== Evo flavor ====
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{{Q-odd-limit intervals|55}}
{{Q-odd-limit intervals|55}}
{{Q-odd-limit intervals|55.05|apx=val|header=none|tag=none|title=15-odd-limit intervals by 55d val mapping}}
{{Q-odd-limit intervals|55.05|apx=val|header=none|tag=none|title=15-odd-limit intervals by 55d val mapping}}
{{Q-odd-limit intervals|54.95|apx=val|header=none|tag=none|title=15-odd-limit intervals by 55f val mapping}}


== Regular temperament properties ==
== Regular temperament properties ==
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| [[Twothirdtonic]] (55f)
| [[Twothirdtonic]] (55f)
|-
|-
|1
| 1
|8\55
| 8\55
|174.5
| 174.5
|[[10/9]]~[[11/10]]
| [[10/9]]~[[11/10]]
|[[Tetracot]] (55c)
| [[Tetracot]] (55c)
|-
|-
| 1
| 1
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| 501.8<br>(65.5)
| 501.8<br>(65.5)
| 4/3<br>(36/35)
| 4/3<br>(36/35)
| [[Hendecatonic]] (55)
| [[Hendecatonic (temperament)|Hendecatonic]] (55)
|}
|}
<nowiki/>* [[Normal lists|Octave-reduced form]], reduced to the first half-octave, and [[Normal lists|minimal form]] in parentheses if distinct
<nowiki/>* [[Normal forms #Equave-reduced-generator form|Octave-reduced form]], reduced to the first half-octave, and [[normal forms #Minimal-generator form|minimal form]] in parentheses if distinct


== Scales ==
== Scales ==
; Subsets of twothirdtonic[37]
; Subsets of Twothirdtonic[37]
* Undecimal otonal-like pentatonic: 17 8 7 12 11
* Undecimal otonal-like pentatonic: 17 8 7 12 11


; Subsets of hendecatonic[33]
; Subsets of Hendecatonic[33]
* Septimal pentatonic-like: 10 13 9 13 10
* Septimal pentatonic-like: 10 13 9 13 10
* Septimal minor blues-like: 13 10 4 5 13 10
* Septimal minor blues-like: 13 10 4 5 13 10
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* [https://www.youtube.com/watch?v=oymJKnYzzOw "Jesus bleibet meine Freude" from ''Herz und Mund und Tat und Leben'', BWV 147] (1723) – arranged for two organs, rendered by Claudi Meneghin (2021)
* [https://www.youtube.com/watch?v=oymJKnYzzOw "Jesus bleibet meine Freude" from ''Herz und Mund und Tat und Leben'', BWV 147] (1723) – arranged for two organs, rendered by Claudi Meneghin (2021)
* [https://www.youtube.com/watch?v=xoCNOIsjfeU "Ricercar a 3" from ''The Musical Offering'', BWV 1079] (1747) – rendered by [[Claudi Meneghin]] (2024)
* [https://www.youtube.com/watch?v=xoCNOIsjfeU "Ricercar a 3" from ''The Musical Offering'', BWV 1079] (1747) – rendered by [[Claudi Meneghin]] (2024)
* [https://www.youtube.com/watch?v=OkRVNo19guo "Ricercar a 6" from ''The Musical Offering'', BWV 1079] (1747) – rendered by Claudi Meneghin (2025)
* "Ricercar a 6" from ''The Musical Offering'', BWV 1079 (1747) – rendered by Claudi Meneghin
** [https://www.youtube.com/watch?v=OkRVNo19guo harpsichord rendition] (2025)
** [https://www.youtube.com/watch?v=X_qROPtHf9g fortepiano rendition] (2025)
** [https://www.youtube.com/watch?v=X9SexO03MTw organ rendition] (2026)
* [https://www.youtube.com/watch?v=Y5sIjh_Te40 "Contrapunctus 4" from ''The Art of Fugue'', BWV 1080] (1742–1749) – rendered by Claudi Meneghin (2024)
* [https://www.youtube.com/watch?v=Y5sIjh_Te40 "Contrapunctus 4" from ''The Art of Fugue'', BWV 1080] (1742–1749) – rendered by Claudi Meneghin (2024)
* [https://www.youtube.com/watch?v=QOPxqNgkVWM "Contrapunctus 11" from ''The Art of Fugue'', BWV 1080] (1742–1749) – rendered by Claudi Meneghin (2024)
* [https://www.youtube.com/watch?v=QOPxqNgkVWM "Contrapunctus 11" from ''The Art of Fugue'', BWV 1080] (1742–1749) – rendered by Claudi Meneghin (2024)
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* [https://www.youtube.com/watch?v=OfOt3nOp-f8 ''Prelude in E Minor "The Great"''] – rendered by [[Claudi Meneghin]] (2023)
* [https://www.youtube.com/watch?v=OfOt3nOp-f8 ''Prelude in E Minor "The Great"''] – rendered by [[Claudi Meneghin]] (2023)
* [https://www.youtube.com/watch?v=tuIPIhSxUPs ''Prelude in E Minor "The Little"''] – rendered by Claudi Meneghin (2024)
* [https://www.youtube.com/watch?v=tuIPIhSxUPs ''Prelude in E Minor "The Little"''] – rendered by Claudi Meneghin (2024)
; {{W|John Bull (composer)|John Bull}}
* [https://www.youtube.com/watch?v=I2d-540RuoM ''Fantasia «Ut Re Mi Fa Sol La»''] (late 1500s/early 1600s, from ''Fitzwilliam Virginal Book Vol.1 No.51'') – rendered by Claudi Meneghin (2026)
; {{W|Louis Couperin}}
* [https://www.youtube.com/shorts/bcgY3k-6rao ''La Piémontoise''] (1658?) – rendered by Claudi Meneghin (2026)


; {{W|Georg Frideric Handel}}
; {{W|Georg Frideric Handel}}
Line 605: Line 619:


; {{W|Scott Joplin}}
; {{W|Scott Joplin}}
* [https://www.youtube.com/watch?v=GbhpuoIJgxk ''Maple Leaf Rag''] (1899) – arranged for harpsichord and rendered by [[Claudi Meneghin]] (2024)
* ''Maple Leaf Rag'' (1899) – arranged for harpsichord and rendered by [[Claudi Meneghin]] ([https://www.youtube.com/watch?v=GbhpuoIJgxk 2024 version]; [https://www.youtube.com/shorts/3Y9y9I6q1as 2026 version])
 
; {{W|Mladen Milićević}}
* [https://www.youtube.com/shorts/1BhIK0s2-vs "The Room" from ''The Room''] (2003) – covered by [[Bryan Deister]] (2026)


; {{W|Wolfgang Amadeus Mozart}}
; {{W|Wolfgang Amadeus Mozart}}
* [https://www.youtube.com/watch?v=C_AML6XW-2g ''Rondo alla Turca'' from the Piano Sonata No. 11, KV 331] (1778) – rendered by Francium (2023)
* [https://www.youtube.com/watch?v=C_AML6XW-2g ''Rondo alla Turca'' from the Piano Sonata No. 11, K. 331] (1778) – rendered by Francium (2023)
* [https://www.youtube.com/watch?v=XgRksdk6zyQ ''Fugue in G minor'', KV 401] (1782) – rendered by Francium (2023)
* [https://www.youtube.com/watch?v=XgRksdk6zyQ ''Fugue in G minor'', K. 401] (1782) – rendered by Francium (2023)
* [http://www.seraph.it/dep/int/AdagioKV540.mp3 ''Adagio in B minor'', KV 540] (1788) – rendered by Carlo Serafini (2011) ([http://www.seraph.it/blog_files/706c4662272db7703def4d57edfcb955-119.html blog entry])
* [http://www.seraph.it/dep/int/AdagioKV540.mp3 ''Adagio in B minor'', K. 540] (1788) – rendered by Carlo Serafini (2011) ([http://www.seraph.it/blog_files/706c4662272db7703def4d57edfcb955-119.html blog entry])
* [https://www.youtube.com/watch?v=pFjJCj2MBTM ''Allegro'' from the Piano Sonata No. 16, KV 545] (1788) – rendered by Francium (2023)
* [https://www.youtube.com/watch?v=pFjJCj2MBTM ''Allegro'' from the Piano Sonata No. 16, K. 545] (1788) – rendered by Francium (2023)
* [https://www.youtube.com/watch?v=p88MWgdio14&list=PLC6ZSKWKnVz0mOTLQkCUi9ydWGLpBP8gZ&index=2 ''Mozart's Gigue KV 574, Arranged for Fortepiano (55-edo)''] – rendered by [[Claudi Meneghin]] (2025)
* ''Kleine Gigue in G'', K. 574 (1789) – rendered by [[Claudi Meneghin]]
** [https://www.youtube.com/watch?v=p88MWgdio14&list=PLC6ZSKWKnVz0mOTLQkCUi9ydWGLpBP8gZ&index=2 Fortepiano rendition] (2025)
** [https://www.youtube.com/shorts/7jt-jzziDBg Harpsichord rendition] (2026)
** [https://www.youtube.com/shorts/9J1DkS5UGzE Organ rendition] (2026)


; {{W|Keiichi Okabe}}
; {{W|Keiichi Okabe}}
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* [https://www.youtube.com/shorts/l62rb8ULCXs ''55edo improv''] (2025)
* [https://www.youtube.com/shorts/l62rb8ULCXs ''55edo improv''] (2025)
* [https://www.youtube.com/watch?v=kVmToKkZU88 ''Waltz in 55edo''] (2025)
* [https://www.youtube.com/watch?v=kVmToKkZU88 ''Waltz in 55edo''] (2025)
* [https://www.youtube.com/shorts/eQHpMFLrjjQ ''55edo prelude''] (2025)


; [[James Kukula]]
; [[James Kukula]]
* ''[https://app.box.com/s/8hq89cb3rqqkrhvkxgvqtppa255kcqrq?fbclid=IwY2xjawISjSlleHRuA2FlbQIxMAABHcl5t8n_C7QUJqdEnwSaWBc5u3BpldmcAjhQQljsQIPl1qJ-zdCr9T8NMw_aem_Ez0m-Ls_ZqI0-c0Ld-28Yg 55edo Melted Syntonic]'' (2025)
* [https://app.box.com/s/8hq89cb3rqqkrhvkxgvqtppa255kcqrq?fbclid=IwY2xjawISjSlleHRuA2FlbQIxMAABHcl5t8n_C7QUJqdEnwSaWBc5u3BpldmcAjhQQljsQIPl1qJ-zdCr9T8NMw_aem_Ez0m-Ls_ZqI0-c0Ld-28Yg ''55edo Melted Syntonic''] (2025)


; [[Budjarn Lambeth]]
; [[Budjarn Lambeth]]
* ''[https://www.youtube.com/watch?v=9c5MtrZFNhA Improvisation One in 55edo]'' (2025)
* [https://www.youtube.com/watch?v=9c5MtrZFNhA ''Improvisation One in 55edo''] (2025)
* ''[https://www.youtube.com/watch?v=ggFGUn1Ya2A Improvisation Two in 55edo]'' (2025)
* [https://www.youtube.com/watch?v=ggFGUn1Ya2A ''Improvisation Two in 55edo''] (2025)


; [[Claudi Meneghin]]
; [[Claudi Meneghin]]
Line 637: Line 658:


; [[Herman Miller]]
; [[Herman Miller]]
* ''[https://soundcloud.com/morphosyntax-1/road-trip-to-nowhere Road Trip to Nowhere]'' (2021)
* [https://soundcloud.com/morphosyntax-1/road-trip-to-nowhere ''Road Trip to Nowhere''] (2021)
* ''[https://soundcloud.com/morphosyntax-1/migration Migration]'' (2025)
* [https://soundcloud.com/morphosyntax-1/migration ''Migration''] (2025)


== External links ==
== External links ==

Latest revision as of 03:43, 24 May 2026

← 54edo 55edo 56edo →
Prime factorization 5 × 11
Step size 21.8182 ¢ 
Fifth 32\55 (698.182 ¢)
Semitones (A1:m2) 4:5 (87.27 ¢ : 109.1 ¢)
Consistency limit 5
Distinct consistency limit 5

55 equal divisions of the octave (abbreviated 55edo or 55ed2), also called 55-tone equal temperament (55tet) or 55 equal temperament (55et) when viewed under a regular temperament perspective, is the tuning system that divides the octave into 55 equal parts of about 21.8 ¢ each. Each step represents a frequency ratio of 21/55, or the 55th root of 2.

Theory

55edo supports meantone, and is close to 1/6-comma meantone. Telemann suggested it as a theoretical basis for analyzing the intervals of meantone. Leopold and Wolfgang Mozart recommended 55edo or something close to it, with a subset and further approximation used for keyboard instruments which (apart from an experimental instrument) did not have enough notes per octave to accommodate it in full.[1] It can also be used for mohajira and liese temperaments. It also supports an extremely sharp tuning of huygens/undecimal meantone using the 55de val, meaning that primes 7 and 11 are mapped very sharply to their second-best mapping. 55edo is a zeta valley edo, suggesting it does not approximate the harmonic series very well for its size.


Odd harmonics

Approximation of odd harmonics in 55edo
Harmonic 3 5 7 9 11 13 15 17 19 21 23
Error Absolute (¢) -3.77 +6.41 -8.83 -7.55 -5.86 +10.38 +2.64 +4.14 +7.94 +9.22 +4.45
Relative (%) -17.3 +29.4 -40.5 -34.6 -26.9 +47.6 +12.1 +19.0 +36.4 +42.3 +20.4
Steps
(reduced)
87
(32)
128
(18)
154
(44)
174
(9)
190
(25)
204
(39)
215
(50)
225
(5)
234
(14)
242
(22)
249
(29)

Subsets and supersets

Since 55 factors into primes as 5 × 11, 55edo contains 5edo and 11edo as its subsets.

Intervals

# Cents Approximate ratios Ups and downs notation
0 0.0 1/1 P1 perfect 1sn D
1 21.8 65/64, 78/77, 99/98, 128/125 ^1 up 1sn ^D
2 43.6 36/35, 64/63 ^^1 dup 1sn ^^D
3 65.5 28/27 vvm2 dudminor 2nd vvEb
4 87.3 21/20, 18/17, 25/24 vm2 downminor 2nd vEb
5 109.1 16/15, 17/16 m2 minor 2nd Eb
6 130.9 13/12, 14/13 ^m2 upminor 2nd ^Eb
7 152.7 12/11, 11/10 ~2 mid 2nd vvE
8 174.5 vM2 downmajor 2nd vE
9 196.4 9/8, 10/9 M2 major 2nd E
10 218.2 17/15 ^M2 upmajor 2nd ^E
11 240.0 8/7 ^^M2 dupmajor 2nd ^^E
12 261.8 7/6 vvm3 dudminor 3rd vvF
13 283.6 13/11 vm3 downminor 3rd vF
14 305.5 6/5 m3 minor 3rd F
15 327.3 ^m3 upminor 3rd ^F
16 349.1 11/9, 27/22 ~3 mid 3rd ^^F
17 370.9 26/21, 16/13 vM3 downmajor 3rd vF#
18 392.7 5/4 M3 major 3rd F#
19 414.5 14/11 ^M3 upmajor 3rd ^F#
20 436.4 9/7 ^^M3 dupmajor 3rd ^^F#
21 458.2 21/16 vv4 dud 4th vvG
22 480.0 v4 down 4th vG
23 501.8 4/3, 27/20 P4 perfect 4th G
24 523.6 ^4 up 4th ^G
25 545.5 11/8, 15/11 ~4 mid 4th ^^G
26 567.3 7/5, 18/13 vA4 downaug 4th vG#
27 589.1 24/17 A4, vd5 aug 4th, downdim 5th G#, vAb
28 610.9 17/12 ^A4, d5 upaug 4th, dim 5th ^G#, Ab
29 632.7 10/7, 13/9 ^d5 updim 5th ^Ab
30 654.5 16/11, 22/15 ~5 mid 5th vvA
31 676.4 v5 down 5th vA
32 698.2 3/2, 40/27 P5 perfect 5th A
33 720.0 ^5 up 5th ^A
34 741.8 32/21 ^^5 dup 5th ^^A
35 763.6 14/9 vvm6 dudminor 6th vvBb
36 785.5 11/7 vm6 downminor 6th vBb
37 807.3 8/5 m6 minor 6th Bb
38 829.1 21/13, 13/8 ^m6 upminor 6th ^Bb
39 850.9 18/11, 44/27 ~6 mid 6th vvB
40 872.7 vM6 downmajor 6th vB
41 894.5 5/3 M6 major 6th B
42 916.4 22/13 ^M6 upmajor 6th ^B
43 938.2 12/7 ^^M6 dupmajor 6th ^^B
44 960.0 7/4 vvm7 dudminor 7th vvC
45 981.8 30/17 vm7 downminor 7th vC
46 1003.6 16/9, 9/5 m7 minor 7th C
47 1025.5 ^m7 upminor 7th ^C
48 1047.3 11/6, 20/11 ~7 mid 7th ^^C
49 1069.1 13/7, 24/13 vM7 downmajor 7th vC#
50 1090.9 15/8, 32/17 M7 major 7th C#
51 1112.7 40/21, 17/9, 48/25 ^M7 upmajor 7th ^C#
52 1134.5 56/27 ^^M7 dupmajor 7th ^^C#
53 1156.4 35/18, 63/32 vv8 dud 8ve vvD
54 1178.2 128/65, 77/39, 196/99, 125/64 v8 down 8ve vD
55 1200.0 2/1 P8 perfect 8ve D

* 55f val (tending flat), inconsistent intervals labeled in italic

Notation

Stein–Zimmermann–Gould notation

Stein–Zimmermann–Gould notation uses sharps and flats combined with quartertone accidentals and arrows:

Step offset 0 1 2 3 4 5 6 7 8 9
Sharp symbol
Flat symbol

Kite's ups and downs notation

55edo can also be notated with Kite's ups and downs, spoken as up, dup, downsharp, sharp, upsharp etc. and down, dud, upflat etc. Note that dup is equivalent to dudsharp and dud is equivalent to dupflat.

Step offset 0 1 2 3 4 5 6 7 8 9
Sharp symbol   
  
  
  
  
  
  
  
Flat symbol
  
  
  
  
  
  
  

Sagittal notation

Evo flavor

Sagittal notationPeriodic table of EDOs with sagittal notation896/89133/32

Revo flavor

Sagittal notationPeriodic table of EDOs with sagittal notation896/89133/32

Evo-SZ flavor

Sagittal notationPeriodic table of EDOs with sagittal notation896/89133/32

31-tone subset

The 31-out-of-55edo subset can be notated entirely with the standard notation of 7 each of naturals/sharps/flats, and 5 each of doublesharps/doubleflats, as a 31-tone chain-of-5ths from Gbb to Ax.

Diagram of 31-tone subset of 55edo using plain Western notation, by Joe Monzo.

Approximation to JI

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Selected 19-limit intervals approximated in 55edo

Selected just intervals by error

The following tables show how 15-odd-limit intervals are represented in 55edo. Prime harmonics are in bold; inconsistent intervals are in italics.

15-odd-limit intervals in 55edo (direct approximation, even if inconsistent)
Interval and complement Error (abs, ¢) Error (rel, %)
1/1, 2/1 0.000 0.0
9/7, 14/9 1.280 5.9
11/9, 18/11 1.683 7.7
11/6, 12/11 2.090 9.6
13/7, 14/13 2.611 12.0
15/8, 16/15 2.640 12.1
11/7, 14/11 2.963 13.6
3/2, 4/3 3.773 17.3
13/9, 18/13 3.890 17.8
13/10, 20/13 3.968 18.2
7/6, 12/7 5.053 23.2
13/11, 22/13 5.573 25.5
11/8, 16/11 5.863 26.9
5/4, 8/5 6.414 29.4
7/5, 10/7 6.579 30.2
9/8, 16/9 7.546 34.6
13/12, 24/13 7.664 35.1
15/13, 26/15 7.741 35.5
9/5, 10/9 7.858 36.0
15/11, 22/15 8.504 39.0
7/4, 8/7 8.826 40.5
11/10, 20/11 9.541 43.7
5/3, 6/5 10.187 46.7
15/14, 28/15 10.352 47.4
13/8, 16/13 10.381 47.6
15-odd-limit intervals in 55edo (patent val mapping)
Interval and complement Error (abs, ¢) Error (rel, %)
1/1, 2/1 0.000 0.0
9/7, 14/9 1.280 5.9
11/9, 18/11 1.683 7.7
11/6, 12/11 2.090 9.6
15/8, 16/15 2.640 12.1
11/7, 14/11 2.963 13.6
3/2, 4/3 3.773 17.3
13/10, 20/13 3.968 18.2
7/6, 12/7 5.053 23.2
11/8, 16/11 5.863 26.9
5/4, 8/5 6.414 29.4
9/8, 16/9 7.546 34.6
15/13, 26/15 7.741 35.5
15/11, 22/15 8.504 39.0
7/4, 8/7 8.826 40.5
5/3, 6/5 10.187 46.7
13/8, 16/13 10.381 47.6
15/14, 28/15 11.466 52.6
11/10, 20/11 12.277 56.3
9/5, 10/9 13.960 64.0
13/12, 24/13 14.155 64.9
7/5, 10/7 15.239 69.8
13/11, 22/13 16.245 74.5
13/9, 18/13 17.928 82.2
13/7, 14/13 19.207 88.0
15-odd-limit intervals by 55d val mapping
Interval and complement Error (abs, ¢) Error (rel, %)
1/1, 2/1 0.000 0.0
11/9, 18/11 1.683 7.7
11/6, 12/11 2.090 9.6
13/7, 14/13 2.611 12.0
15/8, 16/15 2.640 12.1
3/2, 4/3 3.773 17.3
13/10, 20/13 3.968 18.2
11/8, 16/11 5.863 26.9
5/4, 8/5 6.414 29.4
7/5, 10/7 6.579 30.2
9/8, 16/9 7.546 34.6
15/13, 26/15 7.741 35.5
15/11, 22/15 8.504 39.0
5/3, 6/5 10.187 46.7
15/14, 28/15 10.352 47.4
13/8, 16/13 10.381 47.6
11/10, 20/11 12.277 56.3
7/4, 8/7 12.992 59.5
9/5, 10/9 13.960 64.0
13/12, 24/13 14.155 64.9
13/11, 22/13 16.245 74.5
7/6, 12/7 16.765 76.8
13/9, 18/13 17.928 82.2
11/7, 14/11 18.856 86.4
9/7, 14/9 20.539 94.1
15-odd-limit intervals by 55f val mapping
Interval and complement Error (abs, ¢) Error (rel, %)
1/1, 2/1 0.000 0.0
9/7, 14/9 1.280 5.9
11/9, 18/11 1.683 7.7
11/6, 12/11 2.090 9.6
13/7, 14/13 2.611 12.0
15/8, 16/15 2.640 12.1
11/7, 14/11 2.963 13.6
3/2, 4/3 3.773 17.3
13/9, 18/13 3.890 17.8
7/6, 12/7 5.053 23.2
13/11, 22/13 5.573 25.5
11/8, 16/11 5.863 26.9
5/4, 8/5 6.414 29.4
9/8, 16/9 7.546 34.6
13/12, 24/13 7.664 35.1
15/11, 22/15 8.504 39.0
7/4, 8/7 8.826 40.5
5/3, 6/5 10.187 46.7
13/8, 16/13 11.437 52.4
15/14, 28/15 11.466 52.6
11/10, 20/11 12.277 56.3
9/5, 10/9 13.960 64.0
15/13, 26/15 14.077 64.5
7/5, 10/7 15.239 69.8
13/10, 20/13 17.850 81.8

Regular temperament properties

Subgroup Comma list Mapping Optimal
8ve stretch (¢)
Tuning error
Absolute (¢) Relative (%)
2.3 [-87 55 [55 87]] +1.31 1.19 7.21
2.3.5 81/80, [31 1 -14 [55 87 128]] −0.13 2.10 9.63

Uniform maps

13-limit uniform maps between 54.8 and 55.2
Min. size Max. size Wart notation Map
54.7778 54.9113 55cf 55 87 127 154 190 203]
54.9113 54.9935 55f 55 87 128 154 190 203]
54.9935 55.0340 55 55 87 128 154 190 204]
55.0340 55.0668 55d 55 87 128 155 190 204]
55.0668 55.2064 55de 55 87 128 155 191 204]

Commas

Todo: cleanup

5-limit commas: 81/80, [47 -15 -10, [31 1 -14, [27 5 -15

7-limit commas: 31104/30625, 6144/6125, 81648/78125, 16128/15625, 28672/28125, 33075/32768, 83349/80000, 1029/1000, 686/675, 10976/10935, 16807/16384, 84035/82944

11-limit commas: 59049/58564, 74088/73205, 46656/46585, 21609/21296, 12005/11979, 19683/19360, 243/242, 3087/3025, 5488/5445, 19683/19250, 1944/1925, 45927/45056, 2835/2816, 35721/34375, 7056/6875, 12544/12375, 7203/7040, 2401/2376, 24057/24010, 72171/70000, 891/875, 176/175, 2079/2048, 385/384, 3234/3125, 17248/16875, 26411/25600, 26411/2592, 26411/262404, 88209/87808, 30976/30625, 3267/3200, 121/120, 81312/78125, 41503/40000, 41503/40500, 35937/35000, 2662/2625, 42592/42525, 83853/81920, 9317/9216, 65219/62500, 43923/43904, 14641/14400, 14641/14580

13-limit commas: 59535/57122, 29400/28561, 29568/28561, 29645/28561, 24576/24167, 99225/96668, 24500/24167, 50421/48334, 45927/43940, 2268/2197, 2240/2197, 57624/54925, 61875/61516, 57024/54925, 11264/10985, 72765/70304, 13475/13182, 22869/21970, 6776/6591, 20736/20449, 20480/20449, 84035/81796, 91125/91091, 65536/65065, 15309/14872, 1890/1859, 5600/5577, 9604/9295, 59049/57967, 58320/57967, 4374/4225, 864/845, 512/507, 11025/10816, 6125/6084, 21952/21125, 16807/16224, 84035/82134, 66825/66248, 90112/88725, 56133/54080, 693/676, 1540/1521, 26411/25350, 58806/57967, 58080/57967, 88209/84500, 4356/4225, 7744/7605, 88935/86528, 33275/33124, 27951/27040, 9317/9126, 58564/57967, 43923/42250, 17496/17303, 87808/86515, 55296/55055, 25515/25168, 1575/1573, 64827/62920, 4802/4719, 98415/98098, 59049/57200, 729/715, 144/143, 18375/18304, 18522/17875, 10976/10725, 84035/82368, 59049/56875, 11664/11375, 2304/2275, 4096/4095, 1701/1664, 105/104, 42336/40625, 25088/24375, 21609/20800, 2401/2340, 9604/9477, 72171/71344, 2673/2600, 66/65, 352/351, 13475/13312, 33957/32500, 15092/14625, 81675/81536, 58806/56875, 11616/11375, 61952/61425, 68607/66560, 847/832, 4235/4212, 35937/35672, 1331/1300, 5324/5265, 58564/56875, 85293/85184, 13377/13310, 85293/84700, 15288/15125, 31213/30976, 67392/67375, 28431/28160, 34944/34375, 4459/4400, 4459/4455, 28431/28000, 351/350, 79872/78125, 66339/65536, 51597/50000, 637/625, 10192/10125, 31213/30720, 31213/31104, 30888/30625, 1287/1280, 81081/78125, 16016/15625, 49049/48000, 49049/48600, 14157/14000, 33033/32768, 77077/75000, 51909/51200, 17303/17280, 75712/75625, 8281/8250, 41067/40960, 31941/31250, 9464/9375, 57967/57600, 91091/90000, 61347/61250, 79092/78125

Rank-2 temperaments

Table of rank-2 temperaments by generator
Periods
per 8ve
Generator* Cents* Associated
ratio*
Temperament
1 6\55 130.9 14/13 Twothirdtonic (55f)
1 8\55 174.5 10/9~11/10 Tetracot (55c)
1 16\55 349.1 11/9 Mohaha
1 23\55 501.8 4/3 Meantone (55d)
1 26\55 567.3 7/5 Liese (55)
1 27\55 589.1 45/32 Untriton (55d) / aufo (55)
5 17\55
(5\55)
370.9
(109.1)
99/80
(16/15)
Quintosec
11 23\55
(3\55)
501.8
(65.5)
4/3
(36/35)
Hendecatonic (55)

* Octave-reduced form, reduced to the first half-octave, and minimal form in parentheses if distinct

Scales

Subsets of Twothirdtonic[37]
  • Undecimal otonal-like pentatonic: 17 8 7 12 11
Subsets of Hendecatonic[33]
  • Septimal pentatonic-like: 10 13 9 13 10
  • Septimal minor blues-like: 13 10 4 5 13 10
  • Septimal heptatonic blues-like: 13 10 4 5 8 5 10
Others
  • Sakura-like scale containing phi: 9 6 18 5 17
  • Quasi-equiheptatonic scale: 8 8 7 9 7 9 7

Instruments

Music

Modern renderings

Johann Sebastian Bach
Nicolaus Bruhns
John Bull
Louis Couperin
Georg Frideric Handel
Scott Joplin
Mladen Milićević
Wolfgang Amadeus Mozart
Keiichi Okabe

21st century

Bryan Deister
James Kukula
Budjarn Lambeth
Claudi Meneghin
Herman Miller

External links

References

  1. Chesnut, John (1977) Mozart's Teaching of Intonation, Journal of the American Musicological Society Vol. 30, No. 2 (Summer, 1977), pp. 254-271 (Published By: University of California Press) doi.org/10.2307/831219, https://www.jstor.org/stable/831219