The album features songs that address existential themes such as death, helplessness, and heartbreak, moving away from the previous year's musical proposal. The title track of the album is a clear example, with an open critique of the darker and more decadent aspects of big cities. In "San Francisco y el Lobo", David Lebón offers an acoustic ballad. "Perro Andaluz", a composition by García, narrates a love story marked by disillusionment and threat. "Frecuencia Modulada" targets the superficiality of the era, and "Paranoia y Soledad" is a piece where Pedro Aznar demonstrates his versatility by performing all the instruments and showcasing a wide vocal range.
The second side of the album contains some of the most powerful tracks. "Noche de Perros" stands out for a melody built on the distinctive sound of Aznar's fretless bass, culminating in a powerful guitar solo by Lebón. "Viernes 3 AM" captivates from the first moment with its melody and lyrics about anguish and alienation, evoking a nostalgic Buenos Aires atmosphere. The album closes with "Los Sobrevivientes", a portrait of youth in times of dictatorship, and "Canción de Hollywood", which describes the decline of a fading star, recalling the cinematic style of La Máquina de Hacer Pájaros's Películas. This work was recognized by Rolling Stone magazine as one of the best in the history of Argentine rock. The album has had different editions, being converted to CD in 1994 and remastered for its 40th anniversary in 2019.