A maior obra de arte de todos os tempos...

Numa conferência em Hamburgo em 16 de setembro de 2001, Stockhausen foi questionado por um jornalista como os ataques ao World Trade Center o afetaram. Ele respondeu:

"Well, what happened there is, of course — now all of you must adjust your brains — the biggest work of art there has ever been. The fact that spirits achieve with one act something which we in music could never dream of, that people practise ten years madly, fanatically for a concert. And then die. [Hesitantly.] And that is the greatest work of art that exists for the whole Cosmos. Just imagine what happened there. There are people who are so concentrated on this single performance, and then five thousand people are driven to Resurrection. In one moment. I couldn't do that. Compared to that, we are nothing, as composers. [...] It is a crime, you know of course, because the people did not agree to it. They did not come to the "concert". That is obvious. And nobody had told them: "You could be killed in the process." (Stockhausen 2002, 75–76.)