Matthew Sweet marks Earth Day with a look at screen music composed to celebrate the natural world. He is joined by composer Sarah Class, who has written many scores foregrounding environmental issues and for natural history documentaries, and is one of the chosen composers commissioned to write a new piece for the Coronation of Charles III and Camilla. Sarah talks about her approach to writing for wildlife films. As well as music by Sarah the programme features scores from Hans Zimmer, George Fenton, Frank Churchill, Alex Wurman, Harry Gregson-Williams and Éric Serra.