The title refers to the fact that the various instruments perform with each other in different combinations at different times – in other words, in different permutations. There are also passages where everyone plays, but the musical themes are passed around, and varied as the piece progresses, and all parts get an equal share of the action. The last movement, the Samba, is supposed to be an enjoyable romp, with light hearted passages for duets and trios amongst the tutti sections.