This chapter examines the innovative sound design process behind 'Prehistoric Planet,' highlighting the scientific techniques used to recreate dinosaur vocalizations based on modern crocodilians and birds. It explores the anatomical structures, particularly the syrinx, that may have allowed dinosaurs to produce unique sounds and how these are informed by paleontological discoveries. Through a blend of artistic creativity and scientific inquiry, the chapter invites listeners to experience the speculative symphony of a prehistoric soundscape.