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Lipps–Meyer law

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Title: Lipps–Meyer law  
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Subject: Max Friedrich Meyer, Music psychology, Intervals (music), Theodor Lipps, Musical semantics
Collection: Intervals (Music)
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Lipps–Meyer law

The Lipps–Meyer law, named for Theodor Lipps (1851–1914) and Max Friedrich Meyer (1873–1967), hypothesizes that the closure of melodic intervals is determined by "whether or not the end tone of the interval can be represented by the number two or a power of two",[1] in the frequency ratio between notes (see octave).

Perfect fifth. About this sound    About this sound   

"The 'Lipps–Meyer' Law predicts an 'effect of finality' for a melodic interval that ends on a tone which, in terms of an idealized frequency ratio, can be represented as a power of two."[2]

Thus the interval order matters — a perfect fifth, for instance (C,G), ordered , 2:3, gives an "effect of indicated continuation", while , 3:2, gives an "effect of finality".

This is a measure of interval strength or stability and finality. Notice that it is similar to the more common measure of interval strength, which is determined by its approximation to a lower, stronger, or higher, weaker, position in the harmonic series.

The reason for the effect of finality of such interval ratios may be seen as follows. If F = h_2/2^n is the interval ratio in consideration, where n is a positive integer and h_2 is the higher harmonic number of the ratio, then its interval can be determined by taking the base-2 logarithm I=12log_2(h_2/2^n)=12log_2(h_2) - 12n. The difference of these terms is the harmonic series representation of the interval in question (using harmonic numbers), whose bottom note 12n is a transposition of the tonic by n octaves. This suggests why descending interval ratios with denominator a power of two are final. A similar situation is seen if the term in the numerator is a power of two.[3] [4]

Sources

  1. ^ Meyer, M.F. (1929). "The Musician's Arithmetic", The University of Missouri Studies, January.
  2. ^ Robert Gjerdingen, "The Psychology of Music", (2002). The Cambridge History of Western Music Theory, Th. Christensen ed., p.963. ISBN 978-0-521-62371-1.
  3. ^ Krumhansl, Carol L. Cognitive Foundations of Musical Pitch. New York: Oxford UP, 2001. 122. Print
  4. ^ Wright, David. Mathematics and Music. Providence, RI: American Mathematical Society, 2009. 53. Print.
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