Call and response: Musical and bodily interactions in jazz improvisation duos

When individuals coordinate their behaviour, they need to both anticipate actions and respond to each other in meaningful ways. Jazz musicians often encounter situations in jam sessions in which they interact with previously unknown musicians, allowing insights into spontaneous collaboration. The current study investigated call and response patterns in free jazz improvisations by analysing movement and musical characteristics of duos. Twelve jazz musicians were paired into six duos of an e-guitar and a saxophone. Balanced across duos, one musician was asked to play a series of improvisations expressing the emotions happy, sad or neutral. The second musician responded to each improvisation without knowing the emotional intention of the first musician. Call and response roles were then exchanged. While musicians improvised or listened to their duo partner, they were both recorded with an optical motion capture system. Results indicate correspondences between call and response musicians in movement variability and cumulative distance of head motion. There were marked differences between happy and sad emotional expressions both in movement parameters and musical features including mean intensity, mode, and, albeit to a lesser extent, tempo. Retrospective verbal decoding of the call musicians' emotional intentions was correct in 76.5% of all cases. Independently of explicit decoding success and even for the first encounters, musicians spontaneously tuned into each other's performances by means of their body movements and the musical characteristics of the improvisations.