While minimal music does not use typical compositional techniques, it distinguishes itself because of repetitive chords, that gradually changes during the song and fragments that are being layered. The communication with the audience, Glass talked about, showed itself in different reactions of the listeners: “As soon as we saw how angry and hysterical the people reacted, we knew that we did the right thing.” One of the best-known pieces is “4’ 33’’” by John Cage, in which not a single note is being played. The piece consists solely from silence and the noises coming from the audience. In 1964, “In C” by Terry Riley caused a sensation. It is assembled from 53 melodic fragments, and every musician gets to decide on his own when and for how long to play them. Therefore “In C” does not have a set duration.