 Berio 's composition employs elements of jazz and electronic music , and Sanguineti 's libretto <unk> ideas from the works of Dante <unk> , T. S. Eliot and Ezra Pound as well as using his own original work . Berio named " memory , death and usury " as the work 's main concerns , believing these themes to be present in Dante 's work . 
