 Except in the case of the brass group, which is the largest, a percussionist is assigned to each group to maintain its specific tempo, since the groups are independent of one another in terms of rhythm, while the conductor maintains a larger scale organization.The use of groups and their spacing reflects many of Maderna's works, such as "Quadrivium" (1969).In 1977 Krzysztof Penderecki, asked which contemporary composers he liked, said