Zyklus für einen Schlagzeuger (English: Cycle for a Percussionist) is a composition by Karlheinz Stockhausen, assigned Number 9 in the composer's catalog of works. It was composed in 1959 at the request of Wolfgang Steinecke as a test piece for a percussion competition at the Darmstadt Summer Courses, where it was premièred on 25 August 1959 by Christoph Caskel. It quickly became the most frequently played solo percussion work, and “inspired a wave of writing for percussion” (Kurtz 1992, 96).
The work is written for one percussionist playing a marimba, vibraphone (motor off), 4 tom-toms, snare drum, güiro (one or several, if necessary), 2 African log drums (each producing 2 pitches), 2 suspended cymbals of differing sizes, hi-hat, 4 almglocken (suspended, clappers removed), a suspended "bunch of bells" (preferably Indian bells or tambourine mounted on a stand), at least 2 high pitched triangles, gong (with raised boss in center) and tam-tam.
The title of Zyklus is reflected in its form, which is circular and without a set starting point. The score is spiral-bound, and there is no "right-side up"—it may be read with either edge at the top. The performer is free to start at any point, and plays through the work either left to right, or right to left, stopping when the first stroke is reached again. (In this way, it is an example of what Stockhausen calls "polyvalent" form.) The instruments are arranged in a circle around the performer, in the order they are used in the score. The notation is only conventional in some details, and an early review of this first graphic score by Stockhausen remarked that “The initial impression is that one is looking not at a score, but at a drawing by Paul Klee” (Lewinski 1959). Zyklus contains a range of notational specificity, from exactly fixed at one extreme, to open, “variable” passages at the other. Stockhausen composed these elements using a nine-degree scale of statistical distribution, but states that the listener is not "supposed to identify these nine degrees when you hear the music, nevertheless the music that results from such a method has very particular characteristics..." (Stockhausen 1989, 51).
In principle, the percussionist decides on the starting point and direction through the score only at the moment of commencing a performance, but in practice this is almost universally worked out well in advance. Only the percussionist/composer Max Neuhaus claims to have consistently given “spontaneous” versions (Neuhaus 2004).
- 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
- Kurtz, Michael. 1992. Stockhausen: A Biography. Translated by Richard Toop. London: Faber and Faber. ISBN 0-571-14323-7
- Lewinsky, Wolf-Eberhard von. 1959. “Klausur, Studio und Forum in Kranichstein.” Melos 28:302.
- Neuhaus, Max. 2004. Liner notes to Four Realizations of Stockhausen’s Zyklus. Alga Marghen CD ALGA 054CD.
- Stockhausen, Karlheinz. 1989. Stockhausen on Music: Lectures and Interviews. Edited by Robin Maconie. London and New York: Marion Boyars. ISBN 0-7145-2887-0 (cloth) ISBN 0-7145-2918-4 (pbk)
 Further reading
- Gerber, Stuart W. 2003. "Karlheinz Stockhausen's Solo Percussion Music: A Comprehensive Study". DMA diss. Cincinnati: University of Cincinnati.
- Gill, Michael James. 1988. "Zyklus: A Performer's Analysis" [and] "A Video Taped Timpani Method Utilizing Computer Assisted Instruction for Ear Training". Ph.D. diss. Hattiesburg: The University of Southern Mississippi.
- Silberhorn, Heinz. 1977. "Analyse von Stockhausens Zyklus für einen Schlagzeuger". Zeitschrift für Musiktheorie 8, no. 2:29–50.
- Stockhausen, Karlheinz. 1964. "Nr. 9: Zyklus für einen Schlagzeuger (1959)." In his Texte zur Musik, vol. 2 (Aufsätze 1952–1962 zur musikalischen Praxis), edited by Dieter Schnebel, 73–100. DuMont Dokumente. Cologne: Verlag M. DuMont Schauberg.
- Williams, B. Michael. 2001. "Stockhausen: Nr. 9 Zyklus". Percussive Notes 39, no. 3 (June): 60–62, 64–67.