"Sound??", clearly indicates the objective of the work, which is merely to take advantage of the ideas of an innovative jazzman (Roland Kirk) in order to permit an Avant-garde contemporary (John Cage) to speculate with silence and with sound as two facets of the same reality. Kirk appears in the film demonstrating his ability to play three saxophones simultaneously, incorporating at the same time recordings of birdsongs or his giving out whistles to the audience in order that they accompany him "in the key of w, if you please". Parallel to this, Cage talks about his concepts and prepares a piece "musical bicycle" with two of his collaborators at the Seville Theatre of London, introducing Kirk's music in an echo chamber in its search for the sound of silence. Two extraordinary examples of immortal Avant-gardism.