Our countryside could fall silent if current declines in wildlife continue. That is why the RSPB has launched Let Nature Sing - a campaign urging politicians to take advantage of the historic opportunity Brexit offers to pass laws to make the UK a world leader in conservation. On this edition of Nature’s Voice Jane Markham finds out about the campaign’s objectives from the RSPB's deputy director of policy Ruth Davis and talks to folk singer and song collector Sam Lee about how bird song has inspired music for generations.