"Harmonic Bridge" is a work that focuses on the musical nature of inaudible sounds and those people generate without noticing in the structure of London's Millennium Bridge when walking on it. To highlight the musical quality of the bridge as a structure that normally vibrates according to the steps of countless pedestrians, and also depending on such aspects as load and wind, the acoustic characteristics at different parts of the bridge are made audible in real-time by way of vibration sensors.