An Exploratory Study of Polytempo Music Performance with Expert Musicians

Polytempo music – where multiple, simultaneous tempi are performed – poses unique challenges for ensemble coordination, yet empirical research on its performance remains scarce. This exploratory study investigates how expert musicians execute different forms of polytempo, comparing temporal stratification (distant tempi) and phasing-like configurations (close tempi) to both a simple polyrhythm condition and a baseline condition (in which all musicians played at the same tempo). Six highly experienced performers completed 32 trials in which they played isochronous pulses at individually assigned tempi while hearing individualized click tracks that either continued or disappeared early in the trial. We analyzed temporal regularity, tempo change, and group-level success in maintaining prescribed tempo ratios. Across measures, polytempo configurations elicited greater difficulty than the polyrhythm condition, which did not clearly differ from unison tempi, suggesting that expert performers may spontaneously assimilate simple tempo ratios into a shared rhythmic framework. Performances at distant tempi produced significantly more tempo change and markedly lower success in reproducing target ratios than either close tempi or polyrhythms, indicating that temporal stratification is more challenging than phasing when performed without shared structural cues. Individual click tracks had limited influence on stability or coordination, though they did reduce tempo change in both polytempo conditions. These findings provide the first empirical comparison of various types of polytempo performance in an ecologically valid, multi-instrumental context, offering insight into the coordinative demands of contemporary polytempo practice, suggesting new considerations for composers and performers working with complex temporal structures, and shedding new light on the broader cognitive mechanisms involved in resisting the seemingly inescapable tendency to synchronize with one another.