The album, recorded between mid- and late 1975, featured the main participation of Charly Garcia, Maria Rosa Yorio, Raul Porchetto, Nito Mestre, and Leon Giego. It also featured collaborations with top-level musicians such as Oscar Moro, Gustavo Bazterrica, Rinaldo Rafanelli, Alfredo Toth, José Luis Fernández, Leo Sujatovich, Pino Marrone, Horacio Josebachvilli, Frank Ojstersek, Gonzalo Farrugia, and Juan Rodríguez. A unique and unparalleled album in the history of Latin American rock.