Lecture by Kees Tazelaar with performances and sound diffusions of pieces by Jan Boerman, Ton de Leeuw, Henk Badings, Dick Raaijmakers, Jaap Spek, Tom Dissevelt, Edgard Varèse, Ton Bruynèl, Will Eisma, Gottfried Michael Koenig, Kees Tazelaar, Tom Dissevelt, Luc Döbereiner