In this article we seek to build a vision of the monodic proposition by Jacopo Peri (1561-1633), Italian composer of the generation that laid the foundations of accompanied monody and the stile rappresentativo, key assumptions for the development of the Baroque style and the emergence of Opera. Therefore, we present a translation of the first text to present the characteristics and aesthetic purposes of accompanied monody, the preface to the Opera 'Euridice' (Florence, 1600), contextualized by an approach of historical aspects involved in the development and formulation of monody and the publication the work. We also seek to analyse the performance elements found in the text, and the peculiarities of Peri' research and the ideals pursued by the author of resumption of that singing style, he believed, it would have been used in performances of tragedies in antiquity.161149164