The song "L'homme a marcher sur la lune" by Rotten ft Sade talks about the pursuit of dreams and goals, as well as the struggles and challenges faced along the way. The lyrics mention the desire for a better life and the need to find a sense of purpose. The reference to walking on the moon symbolizes reaching for the impossible, while the mention of finding other planets like Mars represents the search for new opportunities and experiences. The song also touches on the idea of being misunderstood and not fitting in, as well as the desire for acceptance and recognition. Overall, the song conveys a message of perseverance and resilience in the face of adversity.