58 equal temperament

In music, 58 equal temperament (also called 58-ET or 58-EDO) divides the octave into 58 equal parts of approximately 20.69 cents each. It is notable as the simplest equal division of the octave to faithfully represent the 17-limit,[1] and the first that distinguishes between all the elements of the 11-limit tonality diamond. The next-smallest equal temperament to do both these things is 72 equal temperament.

Compared to 72-EDO, which is also consistent in the 17-limit, 58-EDO's approximations of most intervals are not quite as good (although still workable). One obvious exception is the perfect fifth (slightly better in 58-EDO), and another is the tridecimal minor third (11:13), which is significantly better in 58-EDO than in 72-EDO. The two systems temper out different commas; 72-EDO tempers out the comma 169:168, thus equating the 14:13 and 13:12 intervals. On the other hand, 58-EDO tempers out 144:143 instead of 169:168, so 14:13 and 13:12 are left distinct, but 13:12 and 12:11 are equated.

58-EDO, unlike 72-EDO, is not a multiple of 12, so the only interval (up to octave equivalency) that it shares with 12-EDO is the 600-cent tritone (which functions as both 17:12 and 24:17). On the other hand, 58-EDO has fewer pitches than 72-EDO and is therefore simpler.

History and use

The medieval Italian music theorist Marchetto da Padova proposed a system that is approximately 29-EDO, which is a subset of 58-EDO, in 1318.[2]

Interval size

interval name size
(steps)
size
(cents)
just
ratio
just
(cents)
error
(cents)
octave 58 1200 2:1 1200 0
perfect fifth 34 703.45 3:2 701.96 +1.49
greater septendecimal tritone 29 600 17:12 603.00 −3.00
lesser septendecimal tritone 24:17 597.00 +3.00
septimal tritone 28 579.31 7:5 582.51 −3.20
eleventh harmonic 27 558.62 11:8 551.32 +7.30
15:11 wide fourth 26 537.93 15:11 536.95 +0.98
perfect fourth 24 496.55 4:3 498.04 −1.49
septimal narrow fourth 23 475.86 21:16 470.78 +5.08
tridecimal major third 22 455.17 13:10 454.21 +0.96
septimal major third 21 434.48 9:7 435.08 −0.60
undecimal major third 20 413.79 14:11 417.51 −3.72
major third 19 393.10 5:4 386.31 +6.79
tridecimal neutral third 17 351.72 16:13 359.47 −7.75
undecimal neutral third 11:9 347.41 +4.31
minor third 15 310.34 6:5 315.64 −5.30
tridecimal minor third 14 289.66 13:11 289.21 +0.45
septimal minor third 13 268.97 7:6 266.87 +2.10
tridecimal semifourth 12 248.28 15:13 247.74 +0.54
septimal whole tone 11 227.59 8:7 231.17 −3.58
whole tone, major tone 10 206.90 9:8 203.91 +2.99
whole tone, minor tone 9 186.21 10:9 182.40 +3.81
greater undecimal neutral second 8 165.52 11:10 165.00 +0.52
lesser undecimal neutral second 7 144.83 12:11 150.64 −5.81
septimal diatonic semitone 6 124.14 15:14 119.44 +4.70
septendecimal semitone; 17th harmonic 5 103.45 17:16 104.96 −1.51
diatonic semitone 16:15 111.73 −8.28
septimal chromatic semitone 4 82.76 21:20 84.47 −1.71
chromatic semitone 3 62.07 25:24 70.67 −8.60
septimal third tone 28:27 62.96 −0.89
septimal quarter tone 2 41.38 36:35 48.77 −7.39
septimal diesis 49:48 35.70 +5.68
septimal comma 1 20.69 64:63 27.26 −6.57
syntonic comma 81:80 21.51 −0.82

See also

References

  1. ^ "consistency / consistent".
  2. ^ "Marchettus, the cadential diesis, and neo-Gothic tunings".

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