THE DEVELOPMENT OF WESTERN
TUNING SYSTEMS AND THE CONTEMPORARY USE OF EXTENDED JUST INTONATION
Momilani Ramstrum
A Research Paper Presented to the Dr. David Ward-Steinman
INTRODUCTION
Background and
Need for Study
Over the last 2500 years,
the tuning systems used in western music have evolved through four major
changes; Pythagorean tuning, just intonation, meantone / well temperament,
and equal temperament. For the past one hundred years, the predominant tuning
system in western music has been equal temperament. Despite the uniform and
unrestricted modulatory freedom that accompanied the widespread adoption
of equal-temperament tuning, there is a growing number of contemporary musicians
who insist on alternative tuning systems to realize their musical goals.
In this paper, we will begin by exploring the historical evolution of western
tuning systems. Then, we will examine the practices of some modern composers
who have turned to extended just intonation, a variation of a Renaissance
tuning system, and examine if their compositional objectives could have been
met within the realm of equal temperament.
Purpose
There are two purposes
for this paper:
1) to explore the development and historical usage of
western tuning systems.
2) to observe how extended just intonation is used by
some contemporary musicians and determine whether their use of just intonation
is an acoustic preference, essential to their compositional process, or if
their compositional goals could have been achieved using equal temperament.
Limitations
This bibliographic research
will be limited to looking at the historical evolvement of tuning systems
and their use in western music. We will the examine the ideologies and compositional
practices of Harry Partch and Ben Johnston to see how they use just intonation
in their creative work.
Methodology
A review of literature
will be undertaken by this author to investigate the origins and common usage
of tuning systems in western music. We will look at the acoustic basis of
this system, and how and when it developed.
Two contemporary composers that employ just intonation
systems in their compositional processes will be observed to note ideologies
and motivation for using alternatives to equal temperament. Historical material
about each composer will be covered as it pertains to their choice of tuning
systems.
Definition of Terms
The following information
on just intonation and equal temperament has been compiled from The
Oxford Concise Dictionary of Music, Source Readings in Music History,
Strobe Tuner Settings for the Historical
Scales, and articles by Bill Alves, Jim
Campbell and David
Canright from the World Wide Web.
Tuning:
A tuning is different than a temperament. In a tuning, all intervals are
pure and derived from the harmonic series. Tuning produces just intonation.
In just tuning, while tuning certain intervals to be pure, this results in
other intervals that are not pure. This is the case in Pythagorean
tuning where all intervals are constructed
by a fifth relation. The resultant pitches are all purely intonated perfect
fifths, but, not purely tuned thirds. Just
intonation is also known
as the 'untempered scale' and is made up of "the pure tones of the unequally
divided octave."
[1] The
intervals in a tuning can all be expressed as a ratio of two integers, e.g.
the ratio 4/3 is a pure perfect fourth and 3/2 is a pure perfect fifth.
[2] These
ratios were first thought to be discovered by Pythagoras as he passed by
a smithy shop and heard that the "strikings of mallets upon the anvil
were dissonant and consonant."
[3] He discovered
that the differences were due to a ratio that was proportional to their weights.
[4] The ratio
of 3:2 produced an interval of the fifth. To generate a scale, you start
with a note and produce perfect fifths above it for seven octaves. This will
generate the twelve notes of the chromatic scale and end at about the same
note as you began (seven octaves up). Instead of being exactly at the same
note, you are actually 24 cents or a quarter of a semi-tone off.
[5] This difference
is called a comma.
In equal temperament,
to compensate for this comma, each fifth was flatted by 2 cents. "When
the resulting twelve notes are all shifted, by octaves, into ascending order,
the result is an equal tempered chromatic scale. The spacing between the
notes of this scale will have intervals which are all equal. "
[6]
Summary
Tuning systems in western music have changed dramatically over the past 2500
years. We have progressed from the predominance of pure intervals as in Pythagorean
and just intonation, to an exclusion of all pure intervals, but the octave,
with the prevalence of equal temperament. Some contemporary composers have
returned to a form of just intonation as a way
of producing purer tones, to generate pitch sets or to
exploit just relationships
over constant fundamentals.
REVIEW OF LITERATURE
History Of Western Tuning Systems
Pythagorus, in the
sixth century B. C., made acoustic experiments with monochords ("An
acoustic instrument with a sounding box, one string and a moveable bridge."
[15] ). While shortening the string of the
monochord by 2/3, he raised the pitch by a fifth. By repeating this shortening
he generated a series of pitches that, when reduced to one octave, formed
the diatonic scale as shown in Example 1.
The diatonic scale of Pythagoras had perfectly tuned
fifths, but, the major thirds were very sharp and the minor thirds were flat.
For this reason thirds and sixths were thought of as dissonances up until
the fifteenth century when the tuning system changed to just intonation.
Example 1.
F - C - G - D - A - E
- B
When reduced to one octave,
this results in a diatonic scale
C - D - E - F - G - A - B - C
By using a second monochord simultaneously, Pythagorus
also discovered that when he shortened the string by 1/2, he could ascend
by octaves. When he ascended to equivalent pitches by octaves and fifths
(seven octaves to twelve fifths), the resultant pitch with the octaves Aristoxemus in the fourth century BC, thought that the
judgment of the ear more important than the math and protested against the
rigidity of the mathematical theories. Aristoxemus had many scales, one of
which was equal temperament. He suggested that since "pitch was a continuum
it could be divided into equal intervals even if the mathematics of Pythagoreans
could not express them as string lengths." Ptolemy in the second century AD, said that "tuning
is best when the ear and ratios are in accord,"
Example 2. 2/1 octave
3/2 perfect fifth
4/3 perfect fourth Superparticular ratios
5/4 major third
6/5 minor third
9/8 major second
5/3 major sixth
16/9 minor seventh
8/5 minor sixth
15/8 major seventh
Ptolemy presented, in his writings, twenty-one tuning
tables In the Middle Ages, the only ancient Greek tuning system
known in detail, was that of Pythagorus. Boethius, in his writings, mentioned
other Greek theorists and scales but presented the mathematical detail of
only
Pythagorus. Just intonation was adopted as the thirds and sixths
became more widely accepted in the Renaissance. It was based on the harmonic
series, combining the pure fifths (3:2) with the major thirds ratios (5:4),
as shown in Example 3. The note E, for example could now be obtained directly
from C
instead of ascending
by fifths (C - G - D - A - E) through four operations
spanning over two octaves..
Example 3.
E B F# C#
F - C - G - D - A - E - B
In Example 4 are the ratios of the scale produced in
just intonation as compared to Pythagorean tuning. The ratios in just intonation
are derived directly from the harmonic series.
Example 4. Comparing
the intervals in just intonation with Pythagorean tuning.
C D E F G A B C
Just Intonation 1/1 9/8 5/4 4/3 3/2 5/3 15/8 2/1 Pythagorean 1/1 9/8 81/64 4/3 3/2 27/16 243/128 2/1
In this way, some of the fifths were tempered slightly
to accommodate the thirds. Just intonation can be thought of as an extension
of Pythagorean tuning. Nicola Vicentino was a sixteenth century theorist and
composer. He advocated chromatic and microtonal music. He even built two
instruments to play all of the ancient Greek genera. One of these was a "harpsichord
with thirty-six keys to an octave called an archicembalo and the other a
comparable
portative organ called an archiorgano" Music theorists "Zarlino, Mersenne and Rameau presented
just intonation as the theoretical basis for the scale but temperament was
[thought to be] a practical necessity." Well temperament was irregular (with more than one odd
sized fifth temperament was used. Mozart and early Beethoven used
meantone temperament The first definition of equal temperament was given by
Salinas in 1577
regarding the placement of frets on the viol.
system for comparing tuning methods with equal temperament
as the
standard. Each octave was assigned 1200 cents. With twelve
equal divisions to the octave, each semitone was equal to 100 cents. Now
there was a method to compare the other systems. different pieces of music, but, deferred instead to the
dictates of the professional tuner.
The development of Western tuning systems can be summarized
in Example 5.
Example 5. Pythagorean
tuning
Just
Intonation
Meantone
Temperament Well Temperament
Equal
Temperament
Equal Temperament Contemporary Temperaments
Equal temperament is
an "acoustical compromise . . . designed to satisfy as completely as
possible three incompatible requirements- true intonation, complete freedom
of modulation and convenience in practical use in keyed instruments.- and
that it sacrifices the first of these to the second and third."
[51] In the ancient diatonic scale, the
scalar steps are uneven, which promotes tonality. In the equal tempered scale,
there are no beginnings and endings and no tonality. Modern music "promotes
neutrality of key centers and abstract harmony. Equal temperament is the
only completely atonal temperament that has existed in history."
[52] " Resistance to equal temperament
was not dead
until 1885. Up until the universal adoption of equal temperament,
tuning practices were quite varied. In his book, scales. from centuries past in temperaments other than in which
the composer wrote. This produces "uniform modulatory indifference
. . . with arbitrary shifts of registration at the harpsichord . . . instead
of a tapestry of differentiated colors . . . and coloring of melody, harmony,
modulation and voice leading as the composer wrote it."
Twentieth Century Practices
In the twentieth century,
despite the predominance of equal temperament tuning and the accompanying
psycho-acoustic adjustment of our ears, many composers are using alternative
tunings. Some performers have initiated temperament recitals where multiple
pianos and harpsichords are onstage, variously tuned so that for each piece,
the instruments can be played in the tunings that the composers wrote.
[59] Composers using alternative tunings
are often referred to as microtonalists and systematically use microtones
in three ways; as embellishments in otherwise
equal temperament music, as smaller than semitone subdivisions
of equal temperament (quarter-tones and eighth-tones) or as various, unequal
subdivisions of the octave (extended just intonation). group that we will look more closely. Microtonalists
that divide the octave unequally into twelve, nineteen, thirty-one, forty-three,
fifty-three or more parts require new or revised instruments, new techniques
of performance, modified ear training and adapted notational systems.
Harry Partch lists his
various musical influences as "Christian hymns, Chinese lullabyes, Yaqui
Indian ritual, Congo puberty ritual, Cantonese music hall and Okies in a
California vineyard." [66] Partch states that "originality
cannot be a goal. It is simply inevitable."
[67] Before he was twenty, he had rejected
the intonation and concert systems of Europe
[68] and set out to find his own intuitive
path. [69] He began to "write music on the
basis of harmonized spoken words, for new instruments and on new scales."
[70] Partch called his music "corporeal,
oral and visual." [71] To Partch, corporeal music involves
"the whole body, the whole person, the whole mind."
[72] "No work of music should be deprived
of being also a work of theater, also a work of dance, also a work of literature,
. . . a work of sculpture . . . and a work of architecture."
[73] The ritualistic and dramatic are a
large part of his work. Partch feels he has given as much time to imaginative
and sculptural forms of instruments as to intonation.
[74] His instruments are large, unusual
and ornamented and are used onstage as a visual part of the performance.
[75]
Partch created a concept that he termed monophony that
was based on a few technical precepts. The ear perceives small number intervals
(2/1, 3/2, 4/3) as consonances. Partch was the center of his own musical universe. His
music could only be played on his own instruments by performers specifically
trained on them and can only be fully appreciated through a live performance.
"many isolated, localized, independent and unique
ways of conceiving and practicing musical art." For Harry Partch, his scalar and intonational choices
were the inevitable by products of his original and inventive way of approaching
his art. He theorized about his choices and often used a specific forty-three
note
scale. But, also, he would create instruments and find
his scales from the sounds they would make. His flexibility was a central
part of his creative approach and fundamental to his compositional process.
Ben Johnston was taught by Harry Partch, John Cage and
Darius Milhaud. Partch always insisted that he wasn't a teacher and considered
Johnston his apprentice. Johnston wanted "to compose music basically in the
European tradition." Johnston feels that just intonation is a more complete
answer and just about everything he has written since 1970 has been in extended
just intonation.
SUMMARY AND CONCLUSIONS
Music and its form
have changed dramatically over the past few millennium; from homophonic melody,
to triadic tonal harmony, to modulating and extended tonality, to the breakdown
of tonality altogether. The accompanying systems of tuning have changed alongside
of these developments in the music itself. Pythagorean tuning was good for
predominantly melodic music while just intonation developed to support triadic
harmony. Meantone and well temperament enabled composers to modulate and
to extend the harmony. Equal temperament was best suited for the chromaticism
of atonal, non-key-centered or serial music.
[94] Today we have seen a return of interest
in tonality and an accompanying resurgence of interest in older tunings by
contemporary composers.
Contemporary composers using alternatives to equal temperament
are called microtonalists. In this paper, we examined two of those using
more than twelve unequal divisions of the octave called extended just intonation.
This author concludes that both Harry Partch and Ben Johnston use alternatives
to equal temperament tuning for ideological reasons that are central to their
compositional process. They could not achieve their musical goals without
using alternative tuning systems.
In listening to the music of the microtonalists, this
author sees two distinct groups. Firstly, are those whose music sounds distinctly
and consistently out of tune with our equally tuned ears. These composers
use intervals in their compositions that are so far distant from our usual
temperament that we, as listeners must adjust our musical judgment drastically
to embrace the music as being acceptable. Both the music of Harry Partch
and Ben Johnston fall into this category. The music has a distinctive character,
and after considerable listening, begins to have a charm, and affability
of its own. The second group of composers use alternative tunings to exploit
the greater resonance of just intonation amongst instruments that are capable
of dynamic tuning (the unfretted stringed instruments and some
of the wind and brass instruments). Of course, there is
overlap between the two groups. At the MicroFest on April 19, 1998 at Pierce
College in Woodland Hills, California, this author viewed the performance
of music by eight contemporary microtonal composers (Lou Harrison, Harry
Partch, Arvo Part, Johnny Reinhard, George Zelenz, Esmaeel Tehrani, and Sasha
Bogdanowitsch). The work by Partch, For future study, this author recommends listening extensively
to works in alternative tunings and comparing the composer's intended scales
with the psycho-aural results. Also she would like to undertake a comparative
study involving contemporary composers and their notational solutions for
alternative tuning. In summary, this author concludes that the use of alternative
tunings by composers is an effective way to extend contemporary musical resources.
And further, that the ideologies, practices and goals of the composers studied,
necessitate their use of alternative tunings because their results could
not have been achieved through the use of equal temperament.
SELECTED
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[Note 2] Barbour, Tuning and Temperament. (East Lansing: Michigan State College Press, 1951), 5.
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[Note 17] "An interesting consideration is the phenomenon of the octave. Why is it, when we consider the audible frequency range from 20 Hz to 20 KHz, we perceive a series of points along this scale that we can consider as having the same "quality" while patently being a different note? Part of the explanation may be that if we take a bi-lateral cross- section through the cochlea, that part of the ear's mechanism responsible for converting acoustic energy into electrical impulses, it reveals a spiral shape which can be described mathematically by a Fibonacci Series; the same maths govern the principles of the harmonic series. Neuro-pathology of the ear shows that octaves are decoded at the same point in each layer of the spiral. Some experts maintain that if the cochlea was a straight cone, rather than a tightly-wound spiral, we would have no perception of the octave at all; all we would hear would be a series of successively rising tones." Chas Stoddard, "A Short History of Tuning and Temperament" (Glastonbury: Stoddard, 1998) accessed April 26, 1998. Available from http://www-math.cudenver.edu/~jstarret/tuninghist.html; Internet.
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[Note 74] Partch, "Barbs," 4.
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[Note 80] Struble, 280.
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[Note 84] Bush, 4.
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