It goes through the history of one of the biggest music festivals in South America, told by its protagonists. Figures of Latin American rock and music speak of their experience in a unique encounter between artists and the public, where the love of rock is the point of convergence. Charly García, Andrés Calamaro, Pappo, Pity Alvarez, among other internationally recognized artists, tell us through interviews compiled throughout the 15 years of the Cosquín Rock edition, the importance of a musical event of this magnitude. Through this film, we can relive the memorable events that have left us many musicians who are no longer in the rock scene, securing the "Myth of the Sierras".