Site Singing is a site-specific augmented reality (AR) app to explore the Freespace and the Art Park at West Kowloon District. Derived from the concept and music created by Hong Kong composer and media artist Gaybird, the AR tour contains six checkpoints to weave a one-hour interactive multi-sensory experience filled with colourful 3D geometries. The app centers on inviting users to open their senses and explore the infinite possibilities of music through sound and sight.