Question: Strahlen (Rays) for a percussionist (vibraphone and/or glockenspiel) and ten-channel sound recording is a composition by which German composer, widely acknowledged by critics as one of the most important ; but also controversial composers of the 20th and early 21st centuries?
Sentence (from "Karlheinz Stockhausen"): A critic calls him "one of the great visionaries of 20th-century music" .
Relevant evidence: No