This article analyses the encounter of Neo-Avant-garde artists with engineers of the Bell Telephone Laboratories in the 9 Evenings. Theatre and Engineering (1966) in an Armory in New York. In the process of engineering, the traffic of signals was reinterpreted from information processing to electronic transmission. The 9 Evenings show exemplarily the importance of artists' work, being part of a new ubiquitous worldorder of networking understood as resonance and vibration, signal traffic, feedback and complexity in systems engineering. Hence, the use of media and their performativity should be part of the history of knowledge and of media theory.