Active as part of several adventurous groups (Orgue Agnès, Kaumwald, Tanz Mein Herz), Ernest Bergez brings electronic and acoustic instruments together into a logic of hybridization.

Solo under the name of Sourdure, he delves in the traditional repertoire of the Massif Central area and develops an idiosyncratic form of songwrinting, in French and Occitan. Prospective and empirical, his approach is found at the junction between a spirit of experimentation, a practice of violin playing and singing rooted in popular tradition, a poetic research in Franco-Occitan bilingualism and a long habit of cooking with various electronic tools.