The Konkrete Etüde (Concrète Étude) is the earliest work of electroacoustic tape music by Karlheinz Stockhausen, composed in 1952 and lasting just three-and-a-quarter minutes. The composer retrospectively gave it the number "⅕" in his catalogue of works.
In January 1952 Stockhausen travelled to Paris to study with Olivier Messiaen, and by March had become familiar with composers such as Pierre Boulez, Jean Barraqué, and Michel Philippot who were working with musique concrète at Pierre Schaeffer's Club d’Essai. Beginning in November, Stockhausen was able to work in the studio, but only recording and cataloguing natural sounds, mainly of percussion instruments. In December, at last, Stockhausen was allowed to make his own piece. Using sounds recorded from a prepared piano, he cut the tape into short pieces, spliced the pieces together, and superimposed the results (Toop 1976, 295–96). This involved taking the attack segment of each sound and repeating it to produce a relatively constant sound (Toop 1979, 387). The result was then transposed using a transposition machine called a phonogène (Stockhausen 1992, 5, 95). The entire process was accomplished in twelve days, concluded on 15 December 1952 (Blumröder 1993, 92). It was the first piece by a non-French composer made in the Paris studio (Frisius 2008, 61). Even before completing the piece, Stockhausen was becoming disillusioned with musique concrète (Toop 1979, 388), and in a letter to Henri Pousseur written only a few months later, Stockhausen described the Etude as a "negative result" (Toop 1976, 297).
Long thought to have been lost, the tape of the Etude was, according to one source, rediscovered by Rudolf Frisius (Kurtz 1992, 56); according to another, it was found by the composer himself, "in a pile of old tapes" (Stockhausen 1992, 7, 97). Even after its rediscovery, Stockhausen did not permit the work to be published until 1992 (Frisius 2008, 64).
There are references to another, earlier and possibly unrealised musique concrète project, Studie über einen Ton (Study on One Sound), in two parts (Kurtz 1992, 56, 261). However, this same title, only in French—Étude sur un seul son—had been used by Boulez for the first of his two concrète études, realised in 1951. Pierre Schaeffer, in an interview conducted many years after the fact, refers to both of these works by the same title and recalled that the tape of Stockhausen's Study on One Sound was only about 50 centimeters long—lasting less than one second at 76.2 cm/s. (Kurtz 1986, 16–17). The situation is further complicated by an entry in a published catalog of Schaeffer's studio, Répertoire acousmatique 1948–1980, naming the last production of 1952 as a work by Stockhausen lasting only 1 min 13 s, and titled Étude "aux mille collants" (Étude of a Thousand Splices) (Frisius 2008, 61–62). Stockhausen also mentions a failed first attempt at realising the Etude:
Already upon hearing two synchronized layers, and even more so hearing three or four layers, I became increasingly pale and helpless: I had imagined something completely different!
On the following day, the sorcery undespairingly continued: I changed my series, chose other sequences, cut other lengths, spliced different progressions, and hoped afresh for a miracle in sound. (Stockhausen 1992, 7 and 97)
Stockhausen built the work on a six-by-six number square (Toop 1976, 298):
Each row of the square is a transposition onto the successive members of the original row (Toop 1981, 158). Durations are based on divisions of tape-length units of 216 cm, which comes to just about three seconds, but is a convenient number for reckoning subdivisions, since 23 × 33 = 216 (Toop 1976, 298).
Each section is assigned a number of sounds from one to six. Once the number of sounds has been determined, the distribution of sounds within each section is specified by a set of what Stockhausen called "modes". Sounds may start or end together, duration and pitch may be linked (the higher the shorter) or not, and successive sounds may precede or follow silences, yielding six different modes which can be manipulated according to the same number square. These modes were to dominate Stockhausen's works for the next few years, in compositions such as Kontra-Punkte, Studie I, and Studie II (Toop 1976, 300).
- Stockhausen, Karlheinz. Elektronische Musik 1952–1960. Etude, Studie I, Studie II, Gesang der Jünglinge, Kontakte. Stockhausen Complete Edition CD 3. Kürten: Stockhausen-Verlag, 1992.
- Karlheinz Stockhausen, Pierre Boulez: New Directions in Music. Él Records ACMEM193CD. Stockhausen, Konkrete Etüde (1952), Zeitmaße (1955–56), Klavierstück XI (1956, four versions, David Tudor, piano); Boulez, Le Marteau sans maître. London: Él in association with Cherry Red Records, 2010.
- Assis, Gustavo Oliveira Alfaix. 2011. Em busca do som: A música de Karlheinz Stockhausen nos anos 1950. São Paulo: Editora UNESP. ISBN 978-85-393-0207-9.
- Blumröder, Christoph von. 1993. Die Grundlegung der Musik Karlheinz Stockhausens. Beihefte zum Arkiv für Musikwissenschaft 32, series edited by Hans Heinrich Eggebrecht in connection with Reinhold Brinkmann, Ludwig Finscher, Kurt von Fischer, Wolfgang Osthoff, and Albrecht Riethmüller. Stuttgart: Franz Steiner Verlag. ISBN 3-515-05696-3.
- Decroupet, Pascal, and Elena Ungeheuer. 1994. "Karel Goeyvaerts und die serielle Tonbandmusik". Revue Belge de Musicologie 48:95–118.
- 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. 1986. "Interview mit Pierre Schaeffer (Paris 25.4.1984)". Zeitschrift für Musikpädagogik 11, no. 33 (January): 5–21.
- Kurtz, Michael. 1992. Stockhausen: A Biography, translated by Richard Toop. London and Boston: Faber and Faber. ISBN 0-571-14323-7 (cloth); ISBN 0-571-17146-X (pbk).
- Maconie, Robin. 2005. Other Planets: The Music of Karlheinz Stockhausen. Lanham, Maryland, Toronto, Oxford: The Scarecrow Press, Inc. ISBN 0-8108-5356-6.
- Quanten, Maarten. 2016. "On the Temporal Organisation of Karlheinz Stockhausen's Early Group Compositions (Konkrete Etüde and Klavierstück I)". In The Musical Legacy of Karlheinz Stockhausen: Looking Back and Forward, edited by M.J. Grant and Imke Misch, 35–51. Hofheim: Wolke Verlag. ISBN 978-3-95593-068-4.
- Stockhausen, Karlheinz. 1992. "Etude (1952): Musique Concrète". Booklet for Karlheinz Stockhausen: Elektronische Musik, 5–7 (German) and 95–100 (English). Stockhausen Complete Edition CD 3. Kürten: Stockhausen-Verlag.
- Toop, Richard. 1976. "Stockhausen's Konkrete Etüde". The Music Review 37, no. 4 (November): 295–300.
- Toop, Richard. 1979. "Stockhausen and the Sine Wave: The Story of an Ambiguous Relationship". The Musical Quarterly 65, no. 3 (July): 379–91.
- Toop, Richard. 1981. "Stockhausen's Electronic Works: Sketches and Worksheets from 1952–1967". Interface 10:149–97.