| http://www.w3.org/ns/prov#value | - Of particular importance are Metastasis (1953-4) ??? a virtual concerto for orchestra; the percussion works Psappha (1975) and Pl????ades (1979); Terretektorh (1966) ??? one of the first compositions to explore space in ways that have subsequently been taken up by such composers as Thea Musgrave and Jonathan Harvey; electronic works created using Xenakis' UPIC system (later developed into HighC) a
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