Save Our Sounds is hoping to create an audio snapshot of the world - but we need your help!
Stop and listen to the sounds around you. Shut your eyes and open your ears.
We can so easily take sound for granted. If you have ever been in a room and only noticed the whirring noise of a fan when somebody switches it off, you understand the point.
The eye is attracted by change, the new and the flashy. Our ears, by contrast, are seduced by the familiar. Yet, all the time, the sound of the world is changing. Precious sounds are dying while new ones enter our lives.
So here at the BBC we want to build a sound map of the world - and save endangered sounds from extinction. And who better to help than avid audio consumers like you?
There are plenty of ways to join in with Save Our Sounds. You can capture sounds yourself and then send the recordings to us on this website, by email, by post or by using the free AudioBoo application on an iPhone.
The Outlook programme featured sounds from five parts of the world which maybe in danger of disappearing.
From the fish wives of Angola - whose songs resonate through the streets of Luanda - click
The click programmes featured a range of experts concerned with acoustic ecology in the urban soundscape.
So come back to the site to hear the shows - available on demand or as podcasts. After all, when it comes to sound, nothing beats listening.