Moonshadow by Cat Stevens is a song about finding hope and resilience in the face of adversity. The key theme is the optimistic outlook on life, where the narrator chooses to find positivity even when faced with loss or difficulties. The 'moonshadow' represents a guiding light or hope that the narrator follows despite the dark times. Moments such as losing body parts metaphorically speak to the idea of losing parts of oneself but still maintaining a positive perspective.