 It is the first progressive-like album by the band, who had previously recorded only the beat-oriented "Ad Gloriam" of 1968.The album begins with the instrumental "Collage", then continues with the sad song "Era inverno" ("It Was Winter"), a conversation between a man and a harlot.The third song, "Cemento armato" ("Reinforced Concrete"), is introduced by piano and describes the situation in the cities.