27/20 - Revision history

Jerdle: /* Trivia */

2025-12-01T02:49:51Z

Trivia

← Older revision		Revision as of 02:49, 1 December 2025
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	== Trivia ==		== Trivia ==
	This ratio is the difference between two common record speeds (~~45rpm~~ and "33"rpm). As such, alterations by this interval often occur when a record is played at the wrong speed.		This ratio is the difference between two common record speeds (45 rpm and "33" rpm). As such, alterations by this interval often occur when a record is played at the wrong speed.

	== See also ==		== See also ==

Jerdle: Discussed record speeds

2025-12-01T02:49:36Z

Discussed record speeds

← Older revision		Revision as of 02:49, 1 December 2025
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	== Approximation ==		== Approximation ==
	{{Interval edo approximation\|27/20}}		{{Interval edo approximation\|27/20}}

			== Trivia ==
			This ratio is the difference between two common record speeds (45rpm and "33"rpm). As such, alterations by this interval often occur when a record is played at the wrong speed.

	== See also ==		== See also ==

Lucius Chiaraviglio: /* Approximation */ Fix typo that made Interval edo approximation not work

2025-11-10T11:42:11Z

Approximation: Fix typo that made Interval edo approximation not work

← Older revision		Revision as of 11:42, 10 November 2025
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	In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6{{cent}}. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5{{cent}}), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls", as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.		In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6{{cent}}. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5{{cent}}), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls", as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.
	== Approximation ==		== Approximation ==
	{{Interval edo approximation\|27/20}		{{Interval edo approximation\|27/20}}

	== See also ==		== See also ==
	* [[40/27]] – its [[octave complement]]		* [[40/27]] – its [[octave complement]]

FloraC: Text replacement - " {{Interval_Edo_Approximation | " to "{{Interval edo approximation|"

2025-11-03T13:06:50Z

Text replacement - " {{Interval_Edo_Approximation | " to "{{Interval edo approximation|"

← Older revision		Revision as of 13:06, 3 November 2025
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	In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6{{cent}}. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5{{cent}}), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls", as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.		In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6{{cent}}. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5{{cent}}), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls", as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.
	== Approximation ==		== Approximation ==
	{{~~Interval_Edo_Approximation~~ \| 27/20}		{{Interval edo approximation\|27/20}
	== See also ==		== See also ==
	* [[40/27]] – its [[octave complement]]		* [[40/27]] – its [[octave complement]]

Pailiaq at 07:21, 3 November 2025

2025-11-03T07:21:01Z

← Older revision		Revision as of 07:21, 3 November 2025
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	In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6{{cent}}. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5{{cent}}), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls", as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.		In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6{{cent}}. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5{{cent}}), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls", as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.
			== Approximation ==
			{{Interval_Edo_Approximation \| 27/20}
	== See also ==		== See also ==
	* [[40/27]] – its [[octave complement]]		* [[40/27]] – its [[octave complement]]

Plumtree: Normalising usage of Infobox Interval

2022-10-25T14:40:09Z

Normalising usage of Infobox Interval

← Older revision		Revision as of 14:40, 25 October 2022
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	{{Infobox Interval		{{Infobox Interval
	~~\| Ratio = 27/20~~		\| Name = wolf fourth, classic acute fourth
	~~\| Monzo = -2 3 -1~~
	~~\| Cents = 519.55129~~
	\| Name = wolf fourth, ~~<br>~~ classic acute fourth
	\| Color name = g4, gu 4th		\| Color name = g4, gu 4th
	~~\| FJS name = P4<sub>5</sub>~~
	\| Sound = jid_27_20_pluck_adu_dr220.mp3		\| Sound = jid_27_20_pluck_adu_dr220.mp3
	}}		}}
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	* [[Gallery of just intervals]]		* [[Gallery of just intervals]]

	~~[[Category:5-limit]]~~
	[[Category:Fourth]]		[[Category:Fourth]]

Fredg999: Misc. edits, categories

2022-03-22T18:27:36Z

Misc. edits, categories

← Older revision		Revision as of 18:27, 22 March 2022
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	{{Infobox Interval		{{Infobox Interval
	~~\| Icon =~~
	\| Ratio = 27/20		\| Ratio = 27/20
	\| Monzo = -2 3 -1		\| Monzo = -2 3 -1
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	}}		}}

	In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6¢. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5¢), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls," as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.		In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6{{cent}}. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5{{cent}}), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls", as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.

	== See also ==		== See also ==

	* [[40/27]] – its [[octave complement]]		* [[40/27]] – its [[octave complement]]
	* [[10/9]] – its [[fifth complement]]		* [[10/9]] – its [[fifth complement]]
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	[[Category:5-limit]]		[[Category:5-limit]]
	~~[[Category:Interval ratio]]~~
	[[Category:Fourth]]		[[Category:Fourth]]

Fredg999 category edits: Removing from Category:Listen using Cat-a-lot

2022-02-22T23:51:31Z

Removing from Category:Listen using Cat-a-lot

← Older revision		Revision as of 23:51, 22 February 2022
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	[[Category:Interval ratio]]		[[Category:Interval ratio]]
	[[Category:Fourth]]		[[Category:Fourth]]
	~~[[Category:Listen]]~~

TallKite: added the color name

2022-02-13T05:24:39Z

added the color name

← Older revision		Revision as of 05:24, 13 February 2022
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	\| Cents = 519.55129		\| Cents = 519.55129
	\| Name = wolf fourth, <br> classic acute fourth		\| Name = wolf fourth, <br> classic acute fourth
	\| Color name =		\| Color name = g4, gu 4th
	\| FJS name = P4<sub>5</sub>		\| FJS name = P4<sub>5</sub>
	\| Sound = jid_27_20_pluck_adu_dr220.mp3		\| Sound = jid_27_20_pluck_adu_dr220.mp3

Aura at 20:10, 28 November 2020

2020-11-28T20:10:50Z

← Older revision		Revision as of 20:10, 28 November 2020
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	\| Monzo = -2 3 -1		\| Monzo = -2 3 -1
	\| Cents = 519.55129		\| Cents = 519.55129
	\| Name = wolf fourth		\| Name = wolf fourth, <br> classic acute fourth
	\| Color name =		\| Color name =
	\| FJS name = P4<sub>5</sub>		\| FJS name = P4<sub>5</sub>
Line 10:		Line 10:
	}}		}}

	In [[5-limit]] [[just intonation]], '''27/20''' is an interval measuring about 519.6¢. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5¢), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls," as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.		In [[5-limit]] [[just intonation]], '''27/20''', the '''classic acute fourth''', is an interval measuring about 519.6¢. It differs from the [[4/3]] perfect fourth by [[81/80]] (about 21.5¢), the syntonic comma. It arises naturally in JI as (for instance) the difference between a 5-limit major third and a stack of five [[3/2]] perfect fifths, or as the interval between [[10/9]] and [[3/2]]. In [[12edo]] and [[meantone]] systems, this interval would be no different from 4/3, as the syntonic comma is tempered out. 27/20 has been described as a "wolf" interval, implying that it "howls," as compared to simpler intervals within the 5-limit such as [[5/4]] and [[9/8]]. Although in a 5-limit context it is traditionally avoided, it can be an essential interval in a harmonic context of higher complexity, where it may be admired for its bright and active character and its distinctness from 4/3.

	== See also ==		== See also ==