In works from "Jeux vénitiens", Lutosławski wrote long passages in which the parts of the ensemble are not to be synchronised exactly. At cues from the conductor, each instrumentalist may be instructed to move straight on to the next section, to finish their current section before moving on, or to stop. In this way, the random elements within compositionally controlled limits defined by the term "aleatory" are carefully directed by the composer, who controls the architecture and harmonic progression of the piece precisely. Lutosławski notated the music exactly; there is no improvisation, no choice of parts is given to any instrumentalist, and there is thus no doubt about how the musical performance is to be realised.