On 1 September 1959, Nono delivered at Darmstadt a polemically charged lecture written in conjunction with his pupil Helmut Lachenmann, "Geschichte und Gegenwart in der Musik von Heute" ("History and Presence in the Music of Today"), in which he criticised and distanced himself from the composers of chance and aleatoric music, then in vogue, under the influence of American models such as John Cage. Although in a seminar a few days earlier Stockhausen had described himself as "perhaps the extreme antipode to Cage", when he spoke of "statistical structures" at the concert devoted to his works on the evening of the same day, the Marxist Nono saw this in terms of "fascist mass structures" and a violent argument erupted between the two friends. In combination with Nono's strongly negative reaction to Stockhausen's interpretation of text-setting in "Il canto sospeso", this effectively ended their friendship until the 1980s, and thus disbanded the "avant-garde trinity" of Boulez, Nono, and Stockhausen.