Info text: Bruno Maderna · Orchestral works · Vol. 4 Quadrivium opened in 1969 Maderna's final creative period, which was characterized by impressive and idiosyncratic works in a large symphonic ensemble: »The title is perhaps a bit literary. I was thinking of the four 'liberal arts' of the Middle Ages: arithmetic, algebra, music and astronomy [...] In addition, the number four has a magical effect: [...]