"Sonic City is a project exploring mobile interaction and wearable technology for everyday music creation. We have designed, implemented and evaluated a system that creates electronic music based on sensing bodily and environmental factors. Mapping these to the real-time processing of concrete sounds, Sonic City generates a personal soundscape co-produced by physical movement, local activity, and urban ambiance. Encounters, events, architecture, (mis)behaviours – all become means of interacting with or 'playing the city'. "