Ambient-Mixer – “Listen to relaxing music, ambient atmospheres, and astonishing sound effects. Just click on an image below to start chilling. If you want, you can even create your own atmospheric sound mix, online and for free. Every audio template can be easily edited for your own needs. Here is a short video explaining some of our features.”
This is a site that has audio templates that they call “atmospheres”. You can also create your own “atmosphere” so that you can get the exact sound you want for when you are working or relaxing.