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'''Eagle 53''' is a [[Gallery of 12-tone tempered scales|12-tone tempered scale]] invented by [[John O'Sullivan]]. It is a subset of [[53edo]].
'''Eagle 53''' is a [[Gallery of 12-tone tempered scales|12-tone tempered scale]] invented by [[John O'Sullivan]]. It is a subset of [[53edo]].
== Conception ==
O'Sullivan designed Eagle 53 to meet the following criteria:
# Every note between 1/1 and 2/1, when paired with both 1/1 and 2/1 must make a high strength or medium strength melodic interval. ("Strong" according to the criteria described in ''Eagle 53 Article'' (2017)).
# The tuning must not have more than 12 notes per octave, so as to fit comfortably on small stringed instruments like ukeleles.
# There must be at least one good chord on each of the twelve notes. ("Good" according to the criteria described in ''Eagle 53 Article'' (2017)).
# These good chords must be playable on a fretted instrument such as a guitar.
The overall aim was to improve upon and replace [[12edo]], by making 12edo's consonances even more in-tune, at least in the most important keys, while also making available new exotic consonances and melodies which 12edo lacks.
Though it used a completely different ''methodology'' than a [[well temperament]], the ''philosophy'' behind Eagle 53 was similar to one. It is not a well temperament, but it achieves many similar aims to one.
== Relationship to other scales ==
Eagle 53 is identical to Euler's Genus Diatonico-chromaticum and Ellis' [[Duodene]], except that those used 45/32 instead of 7/5 in their just version.
This similarity is by coincidence and may simply speak to the fact that this is a useful and relatively simple scale that theorists are likely to land upon over and over, much like [[2L 3s]] or like 53edo itself.


== Scala file ==
== Scala file ==
Line 42: Line 60:
  2/1
  2/1
</pre>
</pre>
== Conception ==
O'Sullivan designed Eagle 53 to meet the following criteria:
# Every note between 1/1 and 2/1, when paired with both 1/1 and 2/1 must make a high strength or medium strength melodic interval. ("Strong" according to the criteria described in ''Eagle 53 Article'' (2017)).
# The tuning must not have more than 12 notes per octave, so as to fit comfortably on small stringed instruments like ukeleles.
# There must be at least one good chord on each of the twelve notes. ("Good" according to the criteria described in ''Eagle 53 Article'' (2017)).
# These good chords must be playable on a fretted instrument such as a guitar.
The overall aim was to improve upon and replace [[12edo]], by making 12edo's consonances even more in-tune, at least in the most important keys, while also making available new exotic consonances and melodies which 12edo lacks.
Though it used a completely different ''methodology'' than a [[well temperament]], the ''philosophy'' behind Eagle 53 was similar to one. It is not a well temperament, but it achieves many similar aims to one.
== Relationship to other scales ==
Eagle 53 is identical to Euler's Genus Diatonico-chromaticum and Ellis' [[Duodene]], except that those used 45/32 instead of 7/5 in their just version.
This similarity is by coincidence and may simply speak to the fact that this is a useful and relatively simple scale that theorists are likely to land upon over and over, much like [[2L 3s]] or like 53edo itself.


== Music ==
== Music ==

Revision as of 10:24, 3 December 2024

Eagle 53 is a 12-tone tempered scale invented by John O'Sullivan. It is a subset of 53edo.

Conception

O'Sullivan designed Eagle 53 to meet the following criteria:

  1. Every note between 1/1 and 2/1, when paired with both 1/1 and 2/1 must make a high strength or medium strength melodic interval. ("Strong" according to the criteria described in Eagle 53 Article (2017)).
  2. The tuning must not have more than 12 notes per octave, so as to fit comfortably on small stringed instruments like ukeleles.
  3. There must be at least one good chord on each of the twelve notes. ("Good" according to the criteria described in Eagle 53 Article (2017)).
  4. These good chords must be playable on a fretted instrument such as a guitar.

The overall aim was to improve upon and replace 12edo, by making 12edo's consonances even more in-tune, at least in the most important keys, while also making available new exotic consonances and melodies which 12edo lacks.

Though it used a completely different methodology than a well temperament, the philosophy behind Eagle 53 was similar to one. It is not a well temperament, but it achieves many similar aims to one.

Relationship to other scales

Eagle 53 is identical to Euler's Genus Diatonico-chromaticum and Ellis' Duodene, except that those used 45/32 instead of 7/5 in their just version.

This similarity is by coincidence and may simply speak to the fact that this is a useful and relatively simple scale that theorists are likely to land upon over and over, much like 2L 3s or like 53edo itself.

Scala file

! eagle53.scl
!
 Eagle 53, John O'Sullivan, key of E
 12
!
 113.2
 203.8
 317.0
 384.9
 498.1
 588.7
 701.9
 815.1
 883.0
 1018.9
 1086.8
 1200.0

Detempering

! eagleJI.scl
!
 Eagle 53 detempering, John O'Sullivan, key of E
 12
!
 16/15
 9/8
 6/5
 5/4
 4/3
 7/5
 3/2
 8/5
 5/3
 9/5
 5/8
 2/1

Music

Further reading

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