sentences:  According to statements by De André within his posthumous autobiography "Una goccia di splendore" ["A drop of brightness"], released in 2011, his collaboration with Francesco De Gregori, which gave birth to four of the eight songs on the album, originated when De André saw his colleague live on stage in Rome and was very impressed.Afterwards, he invited De Gregori to visit him in his rural house in Sardinia, where the two of them spent a month "getting drunk together and writing songs in the meantime.