The Song of the Earth - S1.E5

This natural history of music begins with David playing the piano (rather well, to my untrained ear). Searching for the origins of human music, he traces its connections to the musical sounds that other animals make: the beauty of the wolf's howl, the complexity of the bat's cry, the deep rumble of the elephant's signals, the acoustically sophisticated sounds the dolphin produces and the songs of whales and birds. Why do these animals produce this amazing variety of sounds? It's all tied up with sex and territory.