THE DIARY OF A NATURE SOUND RECORDIST This series aims to take listeners on an epic and intimate journey through the natural world, all through the medium of sound and at the same time we want to enable a rare glimpse into the life of a man who recorded everything you’re about to hear, one sound at a time. Martyn Stewart has spent his lifetime on a mission: to record the natural sounds of our planet. It’s a story that will take us from a council estate in Birmingham England and ultimately take him to every corner of the planet. From Belize to the Arctic Wildlife Refuge, from Denali to the Galapagos, to some of the most inhospitable locations geographically and politically. He will be attacked by lions and crocodiles, arrested in Japan for filming the annual dolphin slaughter and then find himself in long periods of isolation, in remote corners of the world waiting for 30 seconds of a that perfect sound. This is ultimately a love story – dedicated to our natural world and to the people who spend their lives aiming to give it a voice.

Over a lifetime, Martyn Stewart has recorded the sounds of a changing planet. Now, he's made an album with music producer ONR. "Imperfect Cadence" is a call to conserve the wilds of Scotland. For most of us, to hear the birds of the Scottish Highlands - the skylark, the curlew and the wind over the moor - we need somebody else to go there with a microphone. Martyn Stewart has been doing that for decades. He's an audio naturalist, collecting a library of tens of thousands of sounds and documenting the sounds of a changing planet. And his latest project adds music to the mix.

“Sound is the barometer of the health of the planet.” It's almost 60 years since 11-year-old Martyn Stewart made his first recording near his house in Birmingham using a reel-to-reel machine borrowed from his older brother. From that day forward, he set out to capture all the natural sounds of the world, amassing nearly one hundred thousand recordings. Now, musician and sound artist Alice Boyd retraces his steps to three locations in Britain to document how these environmental soundscapes have changed, revealing vanishing ecosystems, amplified human noise and the return of endangered species. (Photograph courtesy of Tom Bright.) With archive from Martyn Stewart's library, The Listening Planet. Location recordings and original music by Alice Boyd. A Falling Tree production for BBC Radio 4

What does it take to capture the sounds of the world's rich and diverse wildlife? On this extraordinary interview, we are joined by sound and nature recordist Martyn Stewart. Stewart has one of the largest collections of natural sounds in the world, having recorded more than 90,000 different sounds in more than 55 different countries for a total of over 60,000 hours of natural sounds. Stunningly, Martyn reveals that two thirds of what he has recorded is now extinct. He talks about what inspired him as a young child to be a nature recordist, and explains you how to open your ears to discover the sounds of the creatures around you. He also talks about what we can do, as ordinary citizens of earth, to lessen the constant encroachment of humans on the natural habitats of the world. This unforgettable conversation might just make you think differently about the world, and who you are in it. All through the episode, Katy uses her brilliant sound-editing skills to weave a backdrop of Martyn's nature sounds to accompany their fascinating conversation.