Herma (Xenakis)

Herma (from Greek ἕρμα "a stringing together, a foundation") is a piece for solo piano composed by Iannis Xenakis in 1961. About ten minutes long,[1] it is based on a formulation of the algebraic equations of Boolean algebra, and is also an example of what Xenakis called symbolic music.

Composition

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 Yūji 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".[2]

Boolean algebra is the main mathematical principle behind Herma.[3] 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.[4]

The piece has been described by the pianist and critic Susan Bradshaw as "[deserving] the label of the most difficult piano piece ever written", because of its extreme tempo.[5]

References
  1. Boosey & Hawkes.
  2. Harley 2004, 26.
  3. Chung 2003, 33.
  4. Harley 2004, 27.
  5. Bradshaw 1972, 349.

Sources

  • Boosey & Hawkes. "Xenakis, Iannis – Herma (1960–61)".
  • Bradshaw, Susan (1972). "The Twentieth Century". In Matthews, Denis (ed.). Keyboard Music. Penguin. ISBN 0-14-021250-7. OCLC 16196425.
  • Chung, Immin (2003). Mathematical and Architectural Concepts Manifested in Iannis Xenakis's Piano Music (DMA). Austin: University of Texas. hdl:2152/511.
  • Harley, James. 2004. Xenakis: His Life in Music. New York: Routledge. ISBN 0-415-97145-4.

Further reading
  • Hill, Peter. 1975. "Xenakis and the Performer". Tempo 112:17–22.
  • Montague, Eugene. 1995. "The Limits of Logic: Structure and Aesthetics in Xenakis's Herma". M.A. thesis. Amherst: University of Massachusetts Amherst. Study based on the thesis available online.
  • Sevrette, Daniel. 1973. "Étude statistique sur Herma". Dissertation, Schola Cantorum. (in French)
  • Solomos, Makis. "À propos des premières œuvres (1953–69) de I. Xenakis". Thesis, University of Paris. (in French)
  • Squibbs, Ron. 1996. "An Analytical Approach to the Music of Iannis Xenakis". Dissertation. New Haven: Yale University.
  • Sward, Rosalie. 1981. "An Examination of the Mathematical Systems used in Selected Compositions of Milton Babbitt and Iannis Xenakis". Dissertation. Evanston: Northwestern University.
  • Wannamaker, Robert. 2001. "Structure and Perception in Herma by Iannis Xenakis". Music Theory Online 7/3.
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