 Michael KurtzMichael Kurtz Sofia Gubaidulina: A Biography, p. 192, English translation Indiana University Press, 2007 (written 2001) Takehisa Kosugi In 1963 Takehisa Kosugi composed for Fluxus 1 a musical piece called Theatre Music in the form of a rectangle of cardstock that bore the trace of a spiral of moving feet.
<clarity>  Michael KurtzMichael Kurtz Sofia Gubaidulina: A Biography, p. 192, English translation Indiana University Press, 2007 (written 2001) Takehisa Kosugi In 1963 Takehisa Kosugi composed for Fluxus 1 a musical piece called Theatre Music in the form of a rectangle of cardstock that bore the trace of a spiral of moving feet.
 Michael KurtzMichael Kurtz Sofia Gubaidulina: A Biography, p. 192, English translation Indiana University Press, 2007 (written 2001) In 1963 Takehisa Kosugi composed for Fluxus 1 a musical piece called Theatre Music in the form of a rectangle of cardstock that bore the trace of a spiral of moving feet.