Born in Warsaw, Kotoński studied there with Piotr Rytel and Tadeusz Szeligowski at the PWSM, graduating in 1951. In an initial period of activity he took an interest in folk music from the Podhale region in southern Poland. After attending the Darmstädter Ferienkurse in 1957–61, he adopted punctualserialism in works like Sześć miniatur for clarinet and piano of 1957 and Muzyka kameralna for 21 instruments and percussion in the following year. This trend culminated in 1959 in Musique en relief for six orchestral groups. His Etiuda na jedno uderzenie w talerz was the first Polish piece of electronic music, created at Polish Radio's Experimental Studio. He also worked in various electronic music studios abroad, amongst others in Cologne, Paris, Freiburg, and Berlin. In 1967 he was appointed lecturer in composition at the Frédéric Chopin Music Academy in Warsaw, where he also directed the electronic music studio. Notably, he wrote the first book in Polish on the field of electronic / electroacoustic music. In the years 1974–1976 he was head music editor at the Polskie Radio and head music director for the Polish Radio and Television. In the years 1980–1983 he was vice president, and in 1983–1989 president of the Polish Section, International Society for Contemporary Music. He presented guest lectures in composition and electroacoustic music at foreign universities in, amongst others, Stockholm, Buffalo, Los Angeles, and Jerusalem. His students included: Jacek Grudzien, Jarosław Kapuściński, Krzysztof Knittel, Konstancja Kochaniec, Stanislaw Krupowicz, Owen Leech, Hanna Kulenty, Pawel Mykietyn, Pawel Szymanski. He died in Warsaw at the age of 89 on 4 September 2014.
Compositions
Poemat, for orchestra
Tańce góralskie , for orchestra
Quartettino, for 4 horns
Preludium i passacaglia, for orchestra
6 miniatur, for clarinet and piano
Muzyka kameralna, for 21 instruments and percussion
Etiuda na jedno uderzenie w talerz , for tape
Musique en relief, cycle of 5 miniatures for 6 orchestral groups
Concerto per quattro, for piano, harpsichord, guitar, harp, and orchestra
Trio, for flute, guitar, and percussion
Canto, for ensemble
Selection I, for clarinet, alto saxophone, tenor saxophone, and guitar
Mikrostruktury, for tape
Musica per fiati e timpani
Monochromia, for oboe
Pezzo, for flute and piano
Wind Quintet, for flute, oboe, clarinet, bassoon, and horn
A battere, for percussion, guitar, viola, violoncello, and harpsichord
Klangspiele, for tape and sound-distribution
Pour quatre, for clarinet, trombone, violoncello, and piano
Muzyka na 16 talerzy i smyczki
Aela, for tape
Multiplay, for 2 trumpets, horn, 2 trombones, and tuba
Concerto for Oboe, Live Electronics, and Orchestra
Harfa Eola , for soprano, alto recorder, autoharp, guitar, and electric organ, all with amplification
Musical Games, for 5 performers
Promenada I, instrumental theatre for 4 performers
Promenada II , instrumental theatre for 3 synthesizers, clarinet, trombone, and violoncello
Skrzydła , for tape
Róża wiatrów , for orchestra
Muzyka wiosenna , for flute, oboe, violin, and synthesizer or tape
Bora, for orchestra
Pełnia lata , for clarinet, violoncello, piano, and live electronics
Sirocco, for orchestra
Pieśń jesienna , for harpsichord and tape
Terra incognita, for orchestra
Sceny liryczne, for 9 performers
Tableaux vivants dans un jardin à l’anglaise, for synthesizer and tape
Instrumenty perkusyjne we wspó/lczesnej orkiestrze Polskie Wydawnictwo Muzyczne, 1963. Second edition, Kraków: Polskie Wydawnictwo Muzyczne, 1981.
*Hungarian trans. by Zsolt Molnár, as A modern zenekar ütöhangszerei Budapest: Zenemükiadó, 1967.
*German trans. by the author, as Schlaginstrumente im modernen Orchester . Mainz: Schott, 1968.
*English trans. by Daria Semegen, as Percussion Instruments in the Contemporary Orchestra. Kraków: Polskie Wydawnictwo Muzyczne, 1968.
"La musique a la Radio Polonaise". La musique en pologne 2, no. 10 : 3–15.
Muzyka elektroniczna. Kraków: Polskie Wydawnictwo Muzyczne, 1989.
"Heterofonia: Stara technika w nowych zastosowaniach" . In Sesja naukowa na temat: Twórczośċ kompozytorów wrocławskich . Zeszyt naukowy: Akademia Muzyczna im. Karola Lipińskiego we Wrocławiu, no. 46 edited by Walentyna Węgrzyn-Klisowska, and Maria Passella. Wroclaw: AM, 1990.
Leksykon wspólczesnej perkusji Kraków: Polskie Wydawnictwo Muzyczne, 1999.