Harry Partch's 43-tone scale

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The Quadrangularis Reversum, one of Partch's instruments featuring the 43-tone scale

The 43-tone scale is a just intonation scale with 43 pitches in each octave, invented and used by Harry Partch.

The first of Partch's "four concepts" is "The scale of musical intervals begins with absolute consonance (1 to 1) and gradually progresses into an infinitude of dissonance, the consonance of the intervals decreasing as the odd numbers of their ratios increase."[1][2] Almost all of Partch's music is written in the 43-tone scale, and although most of his instruments can play only subsets of the full scale, he used it as an all-encompassing framework.

Construction

Partch chose the 11 limit (i.e. all rational numbers with odd factors of numerator and denominator not exceeding 11) as the basis of his music, because the 11th harmonic is the first that is utterly foreign to Western ears.[citation needed] The seventh harmonic is poorly approximated by 12-tone equal temperament, but it appears in ancient Greek scales, is well-approximated by meantone temperament, and it is familiar from the barbershop quartet;[3][4] the ninth harmonic is comparatively well approximated by equal temperament and it exists in Pythagorean tuning (because 3 × 3 = 9); but the 11th harmonic falls right in the middle between two pitches of 12-tone equal temperament (551.3 cents).[citation needed] Although theorists like Hindemith and Schoenberg have suggested that the 11th harmonic is implied by, e.g. F♯ in the key of C,[citation needed] Partch's opinion is that it is simply too far out of tune, and "if the ear does not realize an implication, it does not exist."[5]:126

Ratios of the 11 Limit

Here are all the ratios within the octave with odd factors up to and including 11, known as the 11-limit tonality diamond. Note that the inversion of every interval is also present, so the set is symmetric about the octave.

Cents 0 150.6 165.0 182.4 203.9 231.2 266.9 315.6 347.4 386.3 417.5 435.1 498.0 551.3 582.5
Ratio 1/1 12/11 11/10 10/9 9/8 8/7 7/6 6/5 11/9 5/4 14/11 9/7 4/3 11/8 7/5
41-ET 0.0 5.1 5.6 6.2 7.0 7.9 9.1 10.8 11.9 13.2 14.3 14.9 17.0 18.8 19.9
Audio <phonos file="Unison on C.mid">Play</phonos> <phonos file="Neutral second on C.mid">Play</phonos> <phonos file="Greater undecimal neutral second on C.mid">Play</phonos> <phonos file="Minor tone on C.mid">Play</phonos> <phonos file="Major tone on C.mid">Play</phonos> <phonos file="Septimal major second on C.mid">Play</phonos> <phonos file="Septimal minor third on C.mid">Play</phonos> <phonos file="Just minor third on C.mid">Play</phonos> <phonos file="Undecimal neutral third on C.mid">Play</phonos> <phonos file="Just major third on C.mid">Play</phonos> <phonos file="Undecimal major third on C.mid">Play</phonos> <phonos file="Septimal major third on C.mid">Play</phonos> <phonos file="Just perfect fourth on C.mid">Play</phonos> <phonos file="Eleventh harmonic on C.mid">Play</phonos> <phonos file="Lesser septimal tritone on C.mid">Play</phonos>
Cents 617.5 648.7 702.0 764.9 782.5 813.7 852.6 884.4 933.1 968.8 996.1 1017.6 1035.0 1049.4 1200
Ratio 10/7 16/11 3/2 14/9 11/7 8/5 18/11 5/3 12/7 7/4 16/9 9/5 20/11 11/6 2/1
41-ET 21.1 22.2 24.0 26.1 26.7 27.8 29.1 30.2 31.9 33.1 34.0 34.8 35.4 35.9 41.0
Audio <phonos file="Greater septimal tritone on C.mid">Play</phonos> Audio file "Eleventh harmonic inverse on C.mid" not found <phonos file="Just perfect fifth on C.mid">Play</phonos> <phonos file="Septimal minor sixth on C.mid">Play</phonos> <phonos file="Undecimal minor sixth on C.mid">Play</phonos> <phonos file="Just minor sixth on C.mid">Play</phonos> <phonos file="Undecimal neutral sixth on C.mid">Play</phonos> <phonos file="Just major sixth on C.mid">Play</phonos> <phonos file="Septimal major sixth on C.mid">Play</phonos> <phonos file="Harmonic seventh on C.mid">Play</phonos> <phonos file="Lesser just minor seventh on C.mid">Play</phonos> <phonos file="Greater just minor seventh on C.mid">Play</phonos> <phonos file="Lesser undecimal neutral seventh on C.mid">Play</phonos> <phonos file="Neutral seventh on C.mid">Play</phonos> <phonos file="Perfect octave on C.mid">Play</phonos>

Filling in the gaps

There are two reasons why the 11-limit ratios by themselves would not make a good scale. First, the scale only contains a complete set of chords (otonalities and utonalities) based on one tonic pitch. Second, it contains large gaps, between the tonic and the two pitches to either side, as well as several other places. Both problems can be solved by filling in the gaps with "multiple-number ratios", or intervals obtained from the product or quotient of other intervals within the 11 limit.[original research?]

Cents 0 21.5 53.2 84.5 111.7 150.6
Ratio 1/1 81/80 33/32 21/20 16/15 12/11
Cents 266.9 294.1 315.6
Ratio 7/6 32/27 6/5
Cents 435.1 470.8 498.0 519.5 551.3
Ratio 9/7 21/16 4/3 27/20 11/8
Cents 648.7 680.5 702.0 729.2 764.9
Ratio 16/11 40/27 3/2 32/21 14/9
Cents 884.4 905.9 933.1
Ratio 5/3 27/16 12/7
Cents 1049.4 1088.3 1115.5 1146.8 1178.5 1200
Ratio 11/6 15/8 40/21 64/33 160/81 2/1

Together with the 29 ratios of the 11 limit, these 14 multiple-number ratios make up the full 43-tone scale.[citation needed]

Erv Wilson who worked with Partch has pointed out that these added tones form a constant structure of 41 tones with two variables.[6] A constant structure giving one the property of anytime a ratio appears it will be subtended by the same amount of steps. In this way Partch resolved his harmonic and melodic symmetry in one of the best ways possible.[6]

Other Partch scales

The 43-tone scale was published in Genesis of a Music, and is sometimes known as the Genesis scale, or Partch's pure scale. Other scales he used or considered include a 29-tone scale for adapted viola from 1928, 29-, 37-, and 55-tone scales from an unpublished manuscript titled "Exposition of Monophony" from 1928–33,[7] a 39-tone scale proposed for a keyboard, and a 41-tone scale and an alternative 43-tone scale from "Exposition of Monophony".[citation needed]

Besides the 11-limit diamond, he also published 5- and 13-limit diamonds, and in an unpublished manuscript worked out a 17-limit diamond.[8]

Erv Wilson who did the original drawings in Partch's Genesis of a Music has made a series of diagrams of Partch's diamond as well as others like Diamonds. [9]

See also

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Partch 1974, 87.
  3. ↑ Abbott, Lynn (1992): Play That Barber Shop Chord: A Case for the African-American Origin of Barbershop Harmony. American Music 10, no. 3 (1992), 289–325.
  4. ↑ Döhl, Frédéric (2014): From Harmonic Style to Genre. The Early History (1890s–1940s) of the Uniquely American Musical Term Barbershop. American Music 32, no. 2, 123–171.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Bob Gilmore, "Changing the Metaphor: Ratio Models of Musical Pitch in the Work of Harry Partch, Ben Johnston, and James Tenney", Perspectives of New Music 33, nos. 1 & 2 (Winter–Summer 1995): 458–503. Citation on 462.
  8. ↑ Bob Gilmore, "Changing the Metaphor: Ratio Models of Musical Pitch in the Work of Harry Partch, Ben Johnston, and James Tenney", Perspectives of New Music 33, nos. 1 & 2 (Winter–Summer 1995): 458–503. Citation on 467.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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