This study investigates an automatic modulation system using seat pressure sensors to enhance learning concentration through adaptive music changes. Background music is often used during study sessions, but its effectiveness varies depending on individual differences, task types, and external factors. While some studies suggest that music can influence cognitive performance through arousal and vigilance regulation, the direct impact of music on learning remains inconclusive. This research proposes a novel system that detects the user’s body fluctuations in seat pressure, an indicator of concentration loss, and dynamically modulates the chord progression of background music to maintain or restore focus. An experiment was conducted with twelve university students performing the Kraepelin typing task while listening to either dynamically modulated or non-modulated music. Seat pressure variations were recorded in real time, and subjective evaluations of concentration and musical naturalness were collected. Four participants’ data were excluded due to the failure to detect body movements. Results with eight participants showed no significant differences between conditions, with almost half of the participants favoring modulated music and the other half preferring non-modulated music. High variability in individual responses and task familiarity effects were observed, suggesting that the modulation’s influence on concentration may depend on personal study habits and cognitive styles.