This article reveals the methodology designed to carry out qualitative research into the history of radio with a dual objective: to gather as much data as possible about those who were the pioneers of radio in Catalonia, and to be able to recover, thanks to the use of this method, part of an ancient lost heritage. The results obtained have permitted us to identify the radio presenters who worked in Catalonia from the beginnings of radio broadcasting up to the start of Franco's regime but also to find a sound file from 1934 which allows us to know what Radio Barcelona sounded like