Walter Marchetti (born in 1931) is an Italian composer who adopted John Cage's dadaist aesthetic and pioneered interactive and concrete music. In 1964 he formed the ZAJ group (a sort of European version of Fluxus) with Juan Hidalgo in Madrid. He still active, producing music and performances.
Great fluxus / concrete CD.Not quite sure if this is still in print.Any attempt to order it failed in most known retailers.
get it here