The soundworld of construction work, organized video-rythmically. Video music made from documentary images and concrete sounds. The video machinery is the orchestra. On the tapes: the various instruments. The video composer elaborates on his score via the keyboard of the computer, which then calculates the corresponding editing sequences. They are transmitted to the editing control unit where the instruments are located on the tapes and assembled according to score. After some hours of automatic editing, the composer listens and looks at the product and after and important phase of contemplation types the next score.