Pole (Poles), for two performers with shortwave receivers and a sound projectionist, is a composition by Karlheinz Stockhausen, written in 1970. It is Number 30 in the catalogue of the composer's works.
Pole is the last in a series of works dating from the late 1960s which Stockhausen designated as "process" compositions. These works in effect separate the "form" from the "content" by presenting the performers with a series of transformation signs which are to be applied to material that may vary considerably from one performance to the next. In Pole and three companion works (Kurzwellen for six performers, Spiral for a soloist, and Expo for three), this material is to be drawn spontaneously during the performance from short-wave radio broadcasts (Kohl 1981, 192–93). The processes, indicated primarily by plus, minus, and equal signs, constitute the composition and, despite the unpredictability of the materials, these processes can be heard from one performance to another as being "the same" (Kohl 2010, 137).
Pole was composed in Bali in February 1970, at that time under the working title of Duo (Stockhausen 1978, 152). Between 14 March and 14 September 1970, Pole was played and sung over a thousand times at Expo '70 in Osaka, Japan, in daily performances by twenty different musicians including the composer (Stockhausen 2009, 260). The score is dedicated to Harald Bojé and Péter Eötvös, who played in the majority of the early performances, as well as making a number of radio recordings and a commercially released recording (Stockhausen 1978, 152).
Structure and technique 
Pole consists of a sequence of approximately 200 events, grouped into seven sections divided in the score by wavy barlines. Stockhausen explained that in pieces like this, "the first step is always that of imitating something and the next step is that of transforming what you're able to imitate" (Cott 1973, 33).
Each plus, minus, or equal sign indicates that, upon repetition of an event, the performer is to increase, decrease, or maintain the same level in one of four musical dimensions (or "parameters"): overall duration of the event, number of internal subdivisions, dynamic level, or pitch register/range. It is up to the performer to decide which of these dimensions is to be affected, except that vertically stacked signs must be applied to different parameters (Stockhausen 1973, 1, 11, 21). Despite this indeterminacy, a large number of plus signs (for example) will result in successive events becoming longer, more finely subdivided, louder, and either higher or wider in range; a large number of minus signs will produce the reverse effect (Kohl 2010, 137). To the signs previously used in Prozession, Kurzwellen, Spiral, and Expo Stockhausen adds some new ones and, for the first time, notated the sound-projectionist part which had been left to improvisation in the earlier pieces. At Expo '70, these movements were accomplished using a "rotation mill"—a small box with a crank on the top, like a small coffee grinder (Stockhausen 2009, 262). The spherical auditorium of the German Pavilion literally had poles, one above and the other below the audience platform at the "equator". Boldface plus and minus signs represent the zenith and nadir. The sounds of the two soloists are initially placed at the opposite poles (which may be the front and back of the hall, in ordinary spaces, distributed ovet eight or more channels). At first these sounds occasionally dip toward each other, and then fan out over their respective axes, followed by stairstepping back and forth over independent paths in three dimensions in a breathtaking spatial experience (Kohl 2010, 138).
- Harald Bojé (electronium, shortwave radio) and Péter Eötvös (electrochord, schalmai, Japanese bamboo flute, shortwave radio). With Wach and Japan (from Für kommende Zeiten), and two versions of Spiral. (Recorded 8–10 December 1971 at No. 2 Studio, Abbey Road, London.) EMI 2-LP set. EMI Electrola C165-02 313/314. Reissued on 2-CD set, EMI Classics 6955982. London: The Gramophone Company Limited, 1973.
- Bojé and Eötvös (a different version from the EMI set). Spiral (2 Versionen); Pole. Peter Eötvös, Harald Bojé, Karlheinz Stockhausen. (Recorded 18 April 1971 at WDR, Cologne.) Stockhausen Complete Edition CD 15. Kürten: Stockhausen-Verlag, 1994.
- Pole für zwei (Integral Version). Michael Vetter and Natascha Nikeprelevic (voices and auxiliary instruments). Stockhausen Complete Edition CD 103. Kürten: Stockhausen-Verlag, 2012.
- Cott, Jonathan. 1973. Stockhausen: Conversations with the Composer. New York: Simon and Schuster. ISBN 0-671-21495-0.
- Frisius, Rudolf. 2008. Karlheinz Stockhausen II: Die Werke 1950–1977; Gespräch mit Karlheinz Stockhausen, "Es geht aufwärts". Mainz, London, Berlin, Madrid, New York, Paris, Prague, Tokyo, Toronto: Schott Musik International. ISBN 978-3-7957-0249-6.
- Hopp, Winrich. 1998. Kurzwellen von Karlheinz Stockhausen: Konzeption und musikalische Poiesis. Kölner Schriften zur neuen Musik 6. With CD recording. Mainz and New York: Schott. ISBN 3-7957-1895-3.
- Kohl, Jerome. 2010. "A Child of the Radio Age". In Cut & Splice: Transmission, edited by Daniela Cascella and Lucia Farinati, 135–39. London: Sound and Music. ISBN 978-1-907378-03-4.
- Maconie, Robin. 2005. Other Planets: The Music of Karlheinz Stockhausen. Lanham, Maryland, Toronto, Oxford: The Scarecrow Press, Inc. ISBN 0-8108-5356-6.
- Stockhausen, Karlheinz. 1971. "Ein Abens EXPO 70". In his Texte zur Musik 3, edited by Dieter Schnebel, 229–31. DuMont Dokumente. Cologne: Verlag M. DuMont Schauberg. ISBN 3-7701-0493-5.
- Stockhausen, Karlheinz. 1973. Nr 27 Spiral für einen Solisten. (score) UE 14957. Vienna: Universal Edition.
- Stockhausen, Karlheinz. 1978. "Pole für 2 (1969–70) und Expo für 3 (1969–70)". In his Texte zur Musik 4, edited by Christoph von Blumröder, 152. DuMont Dokumente. Cologne: Verlag M. DuMont Schauberg. ISBN 3-7701-0493-5.
- Stockhausen, Karlheinz. 2009. Kompositorische Grundlagen Neuer Musik: Sechs Seminare für die Darmstädter Ferienkurse 1970, edited by Imke Misch. Kürten: Stockhausen-Stiftung für Musik. ISBN 978-3-00-027313-1.
Further reading 
- Fowler, Michael. 2010. "The Ephemeral Architecture of Stockhausen's Pole für 2". Organised Sound 15, no. 3 (October): 185–97.
- Fritsch, Johannes, and Richard Toop. 2008. "Versuch, eine Grenze zu überschreiten … Johannes Fritsch im Gespräch über die Aufführungspraxis von Werken Karlheinz Stockhausens". MusikTexte no. 116 (February): 31–40.
- Wörner, Karl Heinz. 1973. Stockhausen: Life and Work, translated by Bill Hopkins. Berkeley: University of California Press.