Herma (Xenakis)

Herma (Xenakis)

"Herma" (Greek for "bond" or "foundation", and "germ" or "embryo") is a piece for solo piano composed by Iannis Xenakis in 1961. It is based on a formulation of the algebraic equations of Boolean algebra, and is also a prime example of what Xenakis called symbolic music.

"Herma" was the composer's first major work for piano. It was composed after a visit to Japan in 1961, where Xenakis befriended pianist and composer Yuji Takahashi. Xenakis completed the piece upon his return to Paris and dedicated it to Takahashi, who premièred the piece on February 2, 1962. The pianist's impression of that concert was that the piece "made some excited and wonder, others feel painful" (Harley 2004, 26).

Boolean algebra is the main mathematical principle behind "Herma" (Chung 2003, 33). Xenakis defines several pitch sets and proceeds to apply various logical operations to them. The results are incorporated into music by using successions and combinations of various sets. Stochastic procedures are used to select the order and place of notes within each set (Harley 2004, 27).

References

* Chung, Immin. 2003. "Mathematical and Architectural Concepts Manifested in Iannis Xenakis's Piano Music", dissertation, University of Texas. [http://www.imminchung.com/downloads/Xenakis.pdf Available online.]
* Harley, James. 2004. "Xenakis: His Life in Music", Routledge. ISBN 0415971454
* Hill, Peter. 1975. "Xenakis and the Performer", Tempo 112 (1975), 17–22.
* Montague, Eugene. 1995. "The Limits of Logic: Structure and Aesthetics in Xenakis's "Herma", M.A. thesis, University of Massachusetts. [http://www.ex-tempore.org/montague/index.htm Study based on the thesis available online.]
* Sevrette, Daniel. 1973. "Étude statistique sur Herma". Dissertation, Schola Cantorum. fr icon
* Solomos, Makis. "A propos des premières oeuvres (1953–69) de I. Xenakis". Thesis, University of Paris. fr icon
* Squibbs, Ron. 1996. "An Analytical Approach to the Music of Iannis Xenakis". Dissertation, Yale University. [http://www.ronsquibbs.com/xenakis Available online.]
* Sward, Rosalie. 1981. "An Examination of the Mathematical Systems used in Selected Compositions of Milton Babbitt and Iannis Xenakis". Dissertation, Northwestern University.


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