When the first cell phones were launched, some artists used this new technological support to create works of art. DJ Mobile was a pioneering art app developed in 2005, at a time when mobile apps were not yet prevalent and four years before the first smartphone devices. With DJ Mobile, the audience could create songs using sounds from a building under construction, as well as record audio and image. The app allowed you to select the sounds to compose the melody over a rhythmic foundation, which could be hip-hop, samba or rock. The result was a video with scenes from the construction of a building and music composed from the recorded and remixed sounds. For example, percussion sounds are made by a hammer hitting a nail. The resulting video can be shown on a large screen for all to see. This work was commissioned by Nokia. The public composed 350 pieces using DJ Mobile at the launch event, all created in 12 hours.