"Karlheinz Stockhausen (August 22, 1928 – December 5, 2007) was a German composer, widely acknowledged by critics as one of the most important but also controversial composers of the 20th and early 21st centuries. He is known for his ground–breaking work in electronic music, aleatory (controlled chance) in serial composition, and musical spatialization. ... Similar Artists: Iannis Xenakis, John Cage, Luciano Berio, Luigi Nono, Morton Feldman, Olivier Messiaen, Arnold Schönberg"
(last.fm)
Fig.1 Omnibus (1981). "Tuning In: A Film About Karlheinz Stockhausen", television documentary, BBC1 [published on 13 May 2012 by Thiago Carvalho Fernandes, YouTube].
