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?
Context: Music piracy is the copying and distributing of copies of a piece of music for which the composer, recording artist, or copyright-holding record company did not give consent.  It has a long history, as Beethoven was afflicted with pirated copies of his music, which reduced the income he could make from publishing.  In the contemporary legal environment, it is a form of copyright infringement, which is a civil wrong and, under certain circumstances, even a crime in many countries.  The late 20th and early 21st centuries saw much controversy about copyright piracy, regarding the ethics of redistributing media content, how much production and distribution companies in the media were losing, and the very scope of what ought to be considered "piracy"—and cases involving the piracy of music were among the most frequently discussed in the debate. Derek Antony Parfit, FBA (11 December 1942 – 1 January 2017) was a British philosopher who specialised in personal identity, rationality, and ethics.  He is widely considered one of the most important and influential moral philosophers of the late 20th and early 21st centuries. Stephen Jones OBE (born 1957) is a leading British milliner based in London, who is considered one of the world's most radical and important milliners of the late 20th and early 21st centuries.  He is also one of the most prolific, having created hats for the catwalk shows of many leading couturiers and fashion designers, such as John Galliano at Dior and Vivienne Westwood.  His work is known for its inventiveness and the high level of technical expertise with which he realises his ideas.  Jones co-curated the 2009 exhibition "Hats: An Anthology" for the Victoria and Albert Museum. Phra Dharma Visuddhi Mangala (Bua Ñāṇasampaṇṇo) (RTGS: Phra Thamma Wisutthi Mongkhon (Bua Yanasampanno); Thai: พระธรรมวิสุทธิมงคล (บัว ญาณสมฺปนฺโน) ), commonly known as Ajahn Maha Bua or in Thai Luang Ta Maha Bua (Thai: พระอาจารย์มหาบัว, หลวงตามหาบัว ; the word "Ajahn" (Thai: อาจารย์ ; rtgs: Achan ) means "teacher"), born as Bua Lohitdee (Thai: บัว โลหิตดี ), (August 12, 1913 – January 30, 2011), was a Thai Buddhist monk.  Bua is one of the best known Thai Buddhist monks of the late 20th and early 21st centuries.  He was widely regarded as an Arahant — a living Buddhist saint.  He was a disciple of the esteemed forest master Ajahn Mun Bhuridatta, and was himself considered a master in the Thai Forest Tradition. Behavioural genetics (Commonwealth English) or behavioral genetics (American English), also referred to as behaviour genetics, is a field of scientific research that uses genetic methods to investigate the nature and origins of individual differences in behaviour.  While the name "behavioural genetics" connotes a focus on genetic influences, the field broadly investigates genetic and environmental influences, using research designs that allow removal of the confounding of genes and environment.  Behavioural genetics was founded as a scientific discipline by Francis Galton in the late 19th century, only to be discredited through association with eugenics movements before and during World War II.  In the latter half of the 20th century, the field saw renewed prominence with research on inheritance of behaviour and mental illness in humans (typically using twin and family studies), as well as research on genetically informative model organisms through selective breeding and crosses.  In the late 20th and early 21st centuries, technological advances in molecular genetics made it possible to measure and modify the genome directly.  This led to major advances in model organism research (e.g., knockout mice) and in human studies (e.g., genome-wide association studies), leading to new scientific discoveries. Strahlen (Rays) for a percussionist (vibraphone and/or glockenspiel) and ten-channel sound recording is a composition by Karlheinz Stockhausen, and is Nr.  80½ in his catalog of works.  Its performing duration is 35 minutes. Phra Chanda Thawaro (Thai: (จันทา ถาวโร) ), commonly known as Ajahn Chanda, or Laung Pu Chanda Thawaro in Thai, (Thai: พระอาจารย์จันทา,หลวงปู่จันทา ถาวโร ), born as Chanda Chainit (Thai: จันทา ไชยนิตย์ ) (February 10, 1922 – February 21, 2012), was a Thai Buddhist monk.  Chanda is one of the best known Thai Buddhist monks of the late 20th and early 21st centuries.  He was widely regarded as an Arahant — a living Buddhist saint.  He was a disciple of the esteemed forest master Ajahn Mun Bhuridatta, and was himself considered a master in the Thai Forest Tradition. Karlheinz Stockhausen (] ; 22 August 1928 – 5 December 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.  A critic calls him "one of the great visionaries of 20th-century music" .  He is known for his groundbreaking work in electronic music, for introducing controlled chance (aleatory techniques or aleatoric musical techniques) into serial composition, and for musical spatialization. Custer LaRue is a soprano vocalist of the late 20th and early 21st centuries.  She specializes in Renaissance music and traditional Folk music such as the Child ballads and music collected in Appalachia during the early 20th century. In the late 20th and early 21st centuries, a number of countries have passed laws aimed at reducing discrimination against people with disabilities.  These laws have begun to appear as the notion of civil rights has become more influential globally, and follow other forms of anti-discrimination and equal opportunity legislation aimed at preventing racial discrimination and sexism which began to emerge in the second half of the 20th century.  Many of these Acts aim to reduce barriers for persons with disabilities in the areas of customer service, employment, built environment, transportation, and information and communications.
Answer: Karlheinz Stockhausen