When I go out looking for birds, I can cope with many overlapping sounds at once, some near, some far, and they provide clues and cues as opposed to content. I imagine something not unlike Brian Eno’s ambient music (cf. Music for Airports), where sound is meant to be something you don’t concentrate on, but part of the experience of the space.
I’ve wondered if there is a place for sound on the web that is different from music or sound effects. As Laurian discusses, a way to get more information about the content of a page before you encounter it, much as you gain information about a field or woods by the sounds you hear (and those you don’t).