Yellow Submarine by The Beatles is a whimsical and imaginative song that tells the story of life in a bright, vibrant underwater world. The song is characterized by its playful and childlike tone, depicting an adventure where the narrator and his friends live together in a yellow submarine. Key themes of the song include community, the joy of discovery, and an escape to a fantastical, carefree existence. A particularly poignant moment is the chorus, which repeatedly emphasizes the communal aspect with the phrase 'We all live in a yellow submarine,' reinforcing a sense of unity and shared happiness.