Recording of Eduardo Bértola's Tramos for tape. The piece was made from two sound sources: radio broadcasts and direct recordings of popular events. These materials were structured by simple juxtaposition excluding the mixes and any kind of development of the original sound. It is therefor a purely horizontal structure in which we note the union of fragments of hard edge, perfectly delimited, similar to that used in some works of North American Pop Art. In this way, Bértola expresses his own point of view on the cultural significance and the non-significance of radio mass media in the countries of Latin America.