Composers such as, initially, Karlheinz Stockhausen, Pierre Boulez, Luigi Nono, Bruno Maderna, and later Luciano Berio, Aldo Clementi, Franco Donatoni, Niccolò Castiglioni, Franco Evangelisti, Karel Goeyvaerts, Mauricio Kagel, Gottfried Michael Koenig, Giacomo Manzoni, Henri Pousseur, Helmut Lachenmann, and Brian Ferneyhough presented their radical approach and theories.
These influential composers such as Karlheinz Stockhausen, Pierre Boulez, Luigi Nono, Bruno Maderna, and later Luciano Berio, Aldo Clementi, Franco Donatoni, Niccolò Castiglioni, Franco Evangelisti, Karel Goeyvaerts, Mauricio Kagel, Gottfried Michael Koenig, Giacomo Manzoni, Henri Pousseur, Helmut Lachenmann, and Brian Ferneyhough shared their radical ideas and approaches.