Meaning: The sounds of nature, like the raindrops falling and the birds singing, come together to create a happy and lively rhythm.
Choice of Words: "Rhythm" refers to a pattern of beats or sounds. "Nature" is the world around us, including plants, animals, and landscapes. "Joyful" means full of happiness and delight. "Song" is a musical composition. Here, "nature's joyful song" suggests that the natural world is filled with sounds that create a joyful rhythm.