Synopsis:

Sir David Attenborough chooses his favorite recordings from the natural world that have revolutionized our understanding of song. Each one - from the song of the largest lemur to the song of the humpback whale to the song of the lyrebird - was recorded in his lifetime. The oldest, when he was just five. The most recent, only a few years ago. And one was made by him. "There are seven recordings of song that have particular interest for me," he says. "Some are lovely, some are surprising and one almost broke my heart. But all of them broke new ground".