| http://www.w3.org/ns/prov#value | - signed by approximately 200 artists including Igor Stravinsky, Herbert von Karajan, Luigi Dallapiccola, Hans Werner Henze, Heinz Holliger, Mauricio Kagel, Joseph Keilberth, Otto Klemperer, Gy???rgy Ligeti, Arne Melln???s, Per N???rg???rd, Karlheinz Stockhausen, and Bernd Alois Zimmermann.
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